Devices comprising chondrogenic protein and methods of inducing endochondral bone formation therewith

ABSTRACT

Disclosed are (1) osteogenic devices comprising a matrix containing substantially pure natural-sourced mammalian osteogenic protein; (2) DNA and amino acid sequences for novel polypeptide chains useful as subunits of dimeric osteogenic proteins; (3) vectors carrying sequences encoding these novel polypeptide chains and host cells transfected with these vectors; (4) methods of producing these polypeptide chains using recombinant DNA technology; (5) antibodies specific for these novel polypeptide chains; (6) osteogenic devices comprising these recombinantly produced proteins in association with an appropriate carrier matrix; and (7) methods of using the osteogenic devices to mimic the natural course of endochondral bone formation in mammals.

REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Ser. No. 08/147,023, filed Nov. 1, 1993, now U.S. Pat. No. 5,468,845, which is a divisional of U.S. Ser. No. 07/841,646, filed Feb. 21, 1992, now U.S. Pat. No. 5,266,683, which is a continuation-in-part of U.S. application Ser. Nos.: 1) 07/827,052, filed Jan. 28, 1992, now U.S. Pat. No. 5,250,302 which is a divisional of U.S. Ser. No. 07/179,406, filed Apr. 8, 1988, now U.S. Pat. No. 4,968,590; 2) Ser. No. 07/579,865, filed Sep. 7, 1990, now U.S. Pat. No. 5,108,753 which is a divisional of U.S. Ser. No. 07/179,406, filed Apr. 8, 1988, now U.S. Pat. No. 4,968,590; 3) Ser. No. 07/621,849, filed Dec. 4, 1990, now abandoned, which is a divisional of U.S. Ser. No. 07/232,630, filed Aug. 15, 1988, now abandoned, which is a continuation-in-part of Ser. No. 07/179,406, filed Apr. 8, 1988, now U.S. Pat. No. 4,968,590; 4) Ser. No. 07/995,345, filed Dec. 22, 1992, now U.S. Pat. No. 5,258,494 which is a continuation of Ser. No. 07/621,988, filed Dec. 4, 1990, abandoned, which is a divisional of Ser. No. 07/315,342 filed Feb. 23, 1989, now U.S. Pat. No. 5,011,691 which is a continuation-in-part of Ser. No. 07/232,630 filed Aug. 15, 1988, now abandoned; 5) Ser. No. 07/810,560, filed Dec. 20, 1991, now abandoned, which is a continuation of Ser. No. 07/660,162, filed Feb. 22, 1991, now abandoned, which is a continuation of Ser. No. 07/422,699, filed Oct. 17, 1989, now abandoned, that was a continuation-in-part of Ser. No. 07/315,342, filed Feb. 23, 1989, now U.S. Pat. No. 5,011,691; 6) Ser. No. 07/569,920, filed Aug. 20, 1990, now abandoned, which is a continuation-in-part of Ser. No. 07/422,699, filed Oct. 17, 1989, now abandoned and Ser. No. 07/483,913, filed Feb. 22, 1990, now U.S. Pat No. 5,171,574 which is continuation-in-part of Ser. No. 07/422,613, filed Oct. 17, 1989, now U.S. Pat. No. 4,975,526 which is a continuation-in-part of Ser. No. 07/315,342, filed Feb. 23, 1989, now U.S. Pat. No. 5,011,691; 7) Ser. No. 07/600,024, filed Oct. 18, 1990, now abandoned, which is a continuation-in-part of Ser. No. 07/569,920, filed Aug. 20, 1990, now abandoned; 8) Ser. No. 07/599,543, filed Oct. 18, 1990, now abandoned, which is a continuation-in-part of Ser. No. 07/569,920, filed Aug. 20, 1990, now abandoned; 9) Ser. No. 07/616,374, filed Nov. 21, 1990, now U.S. Pat. No. 5,162,114 which is a divisional of Ser. No. 07/422,613, filed Oct. 17, 1989, now U.S. Pat No. 4,975,526; and 10) Ser. No. 07/483,913, filed Feb. 22, 1990, now U.S. Pat. No. 5,171,574 which is a continuation-in-part of Ser. No. 07/422,613, filed Oct. 17, 1989, now U.S. Pat. No. 4,975,526, and a continuation-in-part of Ser. No. 07/315,342, filed Feb. 23, 1989, now U.S. Pat. No. 5,011,691.

TECHNICAL FIELD OF THE INVENTION

This invention relates to osteogenic devices, to DNA sequences encoding proteins which can induce new bone formation in mammals, and to methods for the production of these proteins in mammalian cells using recombinant DNA techniques, including host cells capable of expressing these sequences. The invention also relates to the proteins expressed from these DNA sequences, to antibodies capable of binding specifically to these proteins, and to bone and cartilage repair procedures using the osteogenic devices. The invention further relates to matrix materials useful for allogenic or xenogenic implants and which act as a carrier of the osteogenic protein to induce new bone formation in mammals.

BACKGROUND OF THE INVENTION

Mammalian bone tissue is known to contain one or more proteinaceous materials, presumably active during growth and natural bone healing, which can induce a developmental cascade of cellular events resulting in endochondral bone formation. This active factor (or factors) has variously been referred to in the literature as bone morphogenetic or morphogenic protein, bone inductive protein, osteogenic protein, osteogenin, or osteoinductive protein.

The developmental cascade of bone differentiation consists of recruitment and proliferation of mesenchymal cells, differentiation of progenitor cells, calcification of cartilage, vascular invasion, bone formation, remodeling, and finally marrow differentiation (Reddi (1981) Collagen Rel. Res. 1:209-226).

Though the precise mechanisms underlying these phenotypic transformations are unclear, it has been shown that the natural endochondral bone differentiation activity of bone matrix can be dissociatively extracted and reconstituted with inactive residual collagenous matrix to restore full bone induction activity (Sampath and Reddi (1981) Proc. Natl. Acad. Sci. USA 78:7599-7603). This provides an experimental method for assaying protein extracts for their ability to induce endochondral bone in vivo. Several species of mammals produce closely related protein as demonstrated by the ability of cross species implants to induce bone formation (Sampath and Reddi (1983) Proc. Natl. Acad. Sci. USA 80:6591-6595).

The potential utility of these proteins has been recognized widely. It is contemplated that the availability of the protein would revolutionize orthopedic medicine, certain types of plastic surgery, dental and various periodontal and craniofacial reconstructive procedures.

The observed properties of these protein fractions have induced an intense research effort in several laboratories directed to isolating and identifying the pure factor or factors responsible for osteogenic activity. The current state of the art of purification of osteogenic protein from mammalian bone is disclosed by Sampath et al. (1987) Proc. Natl. Acad. Sci. USA 84:7109-7113. Urist et al. (1983) Proc. Soc. Exp. Biol. Med. 173:194-199 disclose a human osteogenic protein fraction which was extracted from demineralized cortical bone by means of a calcium chloride-urea inorganic-organic solvent mixture, and retrieved by differential precipitation in guanidine-hydrochloride and preparative gel electrophoresis. The authors report that the protein fraction has an amino acid composition of an acidic polypeptide and a molecular weight in a range of 17-18 kDa. This material was said to be distinct from a protein called "bone derived growth factor" disclosed by Canalis et al. (1980 Science 210:1021-1023, and by Farley et al. (1982) Biochem 21:3508-3513.

Urist et al. (1984) Proc. Natl. Acad. Sci. USA 81:371-375 disclose a bovine bone morphogenetic protein extract having the properties of an acidic polypeptide and a molecular weight of approximately 18 kDa. The authors reported that the protein was present in a fraction separated by hydroxyapatite chromatography, and that it induced bone formation in mouse hindquarter muscle and bone regeneration in trephine defects in rat and dog skulls. Their method of obtaining the extract from bone results in ill-defined and impure preparations.

European Patent Application Ser. No. 148,155, published Oct. 7, 1985, purports to disclose osteogenic proteins derived from bovine, porcine, and human origin. One of the proteins, designated by the inventors as a P3 protein having a molecular weight of 22-24 kDa, is said to have been purified to an essentially homogeneous state. This material is reported to induce bone formation when implanted into animals.

International Application No. PCT/087/01537, published Jan. 14, 1988 (Int. Pub. No. WO88/00205), discloses an impure fraction from bovine bone which has bone induction qualities. The named applicants also disclose putative "bone inductive factors" produced by recombinant DNA techniques. Four DNA sequences were retrieved from human or bovine genomic or cDNA libraries and expressed in recombinant host cells. While the applicants stated that the expressed proteins may be bone morphogenic proteins, bone induction was not demonstrated. This same group reported subsequently ((1988) Science 242:1528-1534) that three of the four factors induce cartilage formation, and postulate that bone formation activity "is due to a mixture of regulatory molecules" and that "bone formation is most likely controlled . . . by the interaction of these molecules." Again, no bone induction was attributed to the products of expression of the cDNAs. See also Urist et al., EPO 0,212,474 entitled "Bone Morphogenic Agents".

Wang et al. (1988) Proc. Nat. Acad. Sci. USA 85: 9484-9488, disclose the partial purification of a bovine bone morphogenetic protein from guanidine extracts of demineralized bone having cartilage and bone formation activity as a basic protein corresponding to a molecular weight of 30 kDa determined from gel elution. Separation of the 30 kDa fraction yielded proteins of 30, 18 and 16 kDa which, upon separation, were inactive. In view of this result, the authors acknowledged that the exact identity of the active material had not been determined.

Wang et al. (1990) Proc. Nat. Acad. Sci. USA 87: 2220-2224 describe the expression and partial purification of one of the cDNA sequences described in PCT 87/01537. Consistent cartilage and/or bone formation with their protein requires a minimum of 600 ng of 50% pure material.

International Application No. PCT/89/04458 published Apr. 19, 1990 (Int. Pub. No. WO90/003733), describes the purification and analysis of a family of osteogenic factors called "P3 OF 31-34". The protein family contains at least four proteins, which are characterized by peptide fragment sequences. The impure mixture P3 OF 31-34 is assayed for osteogenic activity. The activity of the individual proteins is neither assessed nor discussed.

It also has been found that successful implantation of the osteogenic factors for endochondral bone formation requires association of the proteins with a suitable carrier material capable of maintaining the proteins at an in vivo site of application. The carrier should be biocompatible, in vivo biodegradable and porous enough to allow cell infiltration. The insoluble collagen particles remaining after guanidine extraction and delipidation of pulverized bone generally have been found effective in allogenic implants in some species. However, studies have shown that while osteoinductive proteins are useful cross species, the collagenous bone matrix generally used for inducing endochondral bone formation is species-specific (Sampath and Reddi (1983) Proc. Nat. Acad. Sci. USA 80: 6591-6594). Demineralized, delipidated, extracted xenogenic bone matrix carriers implanted in vivo invariably fail to induce osteogenesis, presumably due to inhibitory or immunogenic components in the bone matrix. Even the use of allogenic bone matrix in osteogenic devices may not be sufficient for osteoinductive bone formation in many species. For example, allogenic, subcutaneous implants of demineralized, delipidated monkey bone matrix is reported not to induce bone formation in the monkey. (Asperberg et al. (1988) J. Bone Joint Surg. (Br) 70-B: 625-627).

U.S. Pat. No. 4,563,350, issued Jan. 7, 1986, discloses the use of trypsinized bovine bone matrix as a xenogenic matrix to effect osteogenic activity when implanted with extracted, partially purified bone-inducing protein preparations. Bone formation is said to require the presence of at least 5%, and preferably at least 10%, non-fibrillar collagen. The named inventors claim that removal of telopeptides which are responsible in part for the immunogenicity of collagen preparations is more suitable for xenogenic implants.

European Patent Application Ser. No. 309,241, published Mar. 29, 1989, discloses a device for inducing endochondral bone formation comprising an osteogenic protein preparation, and a matrix carrier comprising 60-98% of either mineral component or bone collagen powder and 2-40% atelopeptide hypoimmunogenic collagen.

Deatherage et al. (1987) Collagen Rel. Res. 7: 2225-2231, purport to disclose an apparently xenogenic implantable device comprising a bovine bone matrix extract that has been minimally purified by a one-step ion exchange column and reconstituted, highly purified human Type-I placental collagen.

U.S. Pat. No. 3,394,370, issued Jul. 7, 1983, describes a matrix of reconstituted collagen purportedly useful in xenogenic implants. The collagen fibers are treated enzymatically to remove potentially immunogenic telopeptides (also the primary source of interfibril crosslinks) and are dissolved to remove associated noncollagen components. The matrix is formulated by dispersing the reconstituted collagen in acetic acid to form a disordered matrix of elementary collagen molecules that is then mixed with osteogenic factor and lyophilized to form a "semi-rigid foam or sponge" that is preferably crosslinked. The formulated matrix is not tested in vivo.

U.S. Pat. No. 4,172,128, issued Oct. 23, 1979, describes a method for degrading and regenerating bone-like material of reduced immunogenicity, said to be useful cross-species. Demineralized bone particles are treated with a swelling agent to dissolve any associated mucopolysaccharides (glycosaminoglycans) and the collagen fibers subsequently dissolved to form a homogenous colloidal solution. A gel of reconstituted fibers then can be formed using physiologically inert mucopolysaccharides and an electrolyte to aid in fibril formation.

It is an object of this invention to provide osteogenic devices comprising matrices containing dispersed osteogenic protein, purified from naturally-sourced material or produced from recombinant DNA, and capable of bone induction in allogenic and xenogenic implants. Another object is to provide novel polypeptide chains useful as subunits of dimeric osteogenic proteins, as well as DNA sequences encoding these polypeptide chains and methods for their production using recombinant DNA techniques. Still another object is to provide recombinant osteogenic proteins expressed from procaryotic or eucaryotic cells, preferably mammalian cells, and capable of inducing endochondral bone formation in mammals, including humans, and to provide methods for their production, including host cells capable of producing these proteins. Still another object is to provide antibodies capable of binding specifically to the proteins of this invention. Yet another object is to provide a biocompatible, in vivo biodegradable matrix capable, in combination with an osteoinductive protein, of producing endochondral bone formation in mammals, including humans.

These and other objects and features of the invention will be apparent from the description, drawings, and claims which follow.

SUMMARY OF THE INVENTION

This invention provides osteogenic proteins and devices which, when implanted in a mammalian body, can induce at the locus of the implant the full developmental cascade of endochondral bone formation including vascularization, mineralization, and bone marrow differentiation. The devices comprise a carrier material, referred to herein as a matrix, having the characteristics disclosed below, and containing dispersed substantially pure osteogenic protein either purified from naturally sourced material or produced using recombinant DNA techniques. Recombinantly produced osteogenic protein may be expressed from procaryotic or eucaryotic cells, most preferably mammalian cells. As used herein "substantially pure" means substantially free of other contaminating proteins having no endochondral bone formation activity.

The substantially pure osteogenic protein may include forms having varying glycosylation patterns, a family of related proteins having regions of amino acid sequence homology, and active truncated or mutated forms of native proteins, no matter how derived.

Preferred embodiments of the recombinant protein dispersed in the matrix disclosed herein closely mimic the physiological activity of native form protein extracted from natural sources and reconstituted in allogenic demineralized, guanidine-extracted bone powder matrix material. The preferred proteins have a specific activity far higher than any biosynthetic material heretofore reported, an activity which, within the limits of precision of the activity assay, appears essentially identical to the substantially pure material produced as set forth in U.S. Pat. No. 4,968,590. Thus, this application discloses how to make and use osteogenic devices which induce the full developmental cascade of endochondral bone formation essentially as it occurs in natural bone healing.

A key to these developments was the elucidation of amino acid sequence and structure data of native osteogenic protein "OP". A protocol was developed which results in retrieval of active, substantially pure osteogenic protein from mammalian bone (e.g., bovine or human) having a half-maximum bone forming activity of about 0.8 to 1.0 ng per mg of implant matrix, as compared to implanted rat demineralized bone matrix (see U.S. Pat. No. 4,968,590). The availability of the material enabled the inventors to elucidate all structural details of the protein necessary to achieve bone formation. Knowledge of the protein's amino acid sequence and other structural features enabled the identification and cloning of genes encoding native osteogenic proteins.

The osteogenic protein in its mature native form is a glycosylated dimer and has an apparent molecular weight of about 30 kDa as determined by SDS-PAGE. When reduced, the 30 kDa protein gives rise to two glycosylated polypeptide chains (subunits) having apparent molecular weights of about 16 kDa and 18 kDa. In the reduced state, the 30 kDa protein has no detectable osteogenic activity. The unglycosylated protein, which has osteogenic activity, has an apparent molecular weight of about 27 kDa. When reduced, the 27 kDa protein gives rise to two unglycosylated polypeptides having molecular weights of about 14 kDa to 16 kDa.

Naturally-sourced osteogenic protein derived from bovine bone, herein referred to as "bOP" and in related applications as "BOP", is further characterized by the approximate amino acid composition set forth below:

    ______________________________________     Amino acid               Rel. no.    Amino acid                                     Rel. no.     residue   res./molec. residue   res./molec.     ______________________________________     Asp/Asn   22          Tyr       11     Glu/Gln   24          Val       14     Ser       24          Met        3     Gly       29          Cys       16     His        5          Ile       15     Arg       13          Leu       15     Thr       11          Pro       14     Ala       18          Phe        7     Lys       12          Trp       ND     ______________________________________

Analysis of digestion fragments from naturally-sourced material purified from bone indicates that the substantially pure material isolated from bone contains the following amino acid sequences:

    (1)   Ser-Phe-Asp-Ala-Tyr-Tyr-Cys-Ser-Gly-Ala-Cys-           Gln-Phe-Pro-Met-Pro-Lys;     (2)   Ser-Leu-Lys-Pro-Ser-Asn-Tyr-Ala-Thr-Ile-Gln-           Ser-Ile-Val;     (3)   Ala-Cys-Cys-Val-Pro-Thr-Glu-Leu-Ser-Ala-Ile-           Ser-Met-Leu-Tyr-Leu-Asp-Glu-Asn-Glu-Lys;     (4)   Met-Ser-Ser-Leu-Ser-Ile-Leu-Phe-Phe-Asp-Glu-           Asn-Lys;     (5)   Val-Gly-Val-Val-Pro-Gly-Ile-Pro-Glu-Pro-Cys-           Cys-Val-Pro-Glu;     (6)   Val-Asp-Phe-Ala-Asp-Ile-Gly     (7)   Val-Pro-Lys-Pro; and     (8)   Ala-Pro-Thr.

A consensus DNA gene sequence based in part on these partial amino acid sequence data and on observed homologies with structurally related genes reported in the literature (or the sequences they encode), having a presumed or demonstrated unrelated developmental function, was used as a probe for identifying and isolating genes encoding osteogenic proteins from genomic and cDNA libraries. The consensus sequence probe enabled isolation of a previously unidentified DNA sequence from human genomic and cDNA libraries, portions of which, when appropriately cleaved and ligated, encode a protein comprising a region capable of inducing endochondral bone formation when properly modified, incorporated in a suitable matrix, and implanted as disclosed herein. The predicted amino acid sequence of the encoded protein includes sequences identified in peptide fragments obtained from the substantially pure osteogenic protein (see infra and Kuber Sampath et al. (1990) J. Biol. Chem. 265:13198-13205.) The protein has been expressed from the full length cDNA sequence (referred to herein as "hOP1"), as well as from various truncated DNAs and fusion constructs in both procaryotes (e.g., E. coli) and eucaryotes (various mammalian cells and cell lines) and shown to exhibit osteogenic activity. The OP1 protein in combination with BMP2B also is active (see infra).

Table I lists the various species of the hOP1 protein identified to date, including their expression sources and nomenclature and Sequence Listing references. In its native form, hOP1 expression yields an immature translation product ("hOP1-PP", where "PP" refers to "prepro form") of about 400 amino acids that subsequently is processed to yield a mature sequence of 139 amino acids ("OP1-18Ser".) The active region (functional domain) of the protein includes the C-terminal 97 amino acids of the OP1 sequence ("OPS"). A longer active sequence is OP7 (comprising the C-terminal 102 amino acids).

The consensus sequence probe also retrieved human DNA sequences identified in PCT/087/01537, referenced above, designated therein as BMP2 (Class I and II), and BMP3. The inventors herein discovered that certain subparts of the sequences designated in PCT/087/01537 as BMP-2 Class I and BMP-2 Class II, also referred to in the literature as BMP2 and BMP4, respectively, when properly assembled, encode proteins (referred to herein as "CBMP2A" and "CBMP2B," respectively) which have true osteogenic activity, i.e., induce the full cascade of events leading to endochondral bone formation when properly folded, dimerized, and implanted in a mammal. Seq. Listing ID Nos. 4 and 6 disclose the cDNA sequences and encoded "prepro" forms of CBMP2A and CBMP2B, respectively. (Nomenclature note: as used herein, "CBMP2(a)" and "CBMP2(b)" refer to the DNA sequence; "CBMP2A" and "CBMP2B" refer to the encoded proteins.) The functional domain (active region) of the CBMP2 proteins comprises essentially amino acid residues 301-396 of Seq. ID No. 4 (designated "CBMP2AS") and residues 313-408 of ID No. 6 (designated "CBMP2BS"). Longer active regions are defined by residues 296-396 of Seq. ID No. 4 ("CBMP2AL") and residues 308-408 of Seq. ID No. 6 ("CBMP2BL"). The CBMP2 proteins share approximately 58-60% amino acid sequence homology with OP1 in the active region (e.g., with OPS or OP7).

As indicated above, the natural-sourced osteogenic protein is a glycosylated dimer comprising an 18 kDa subunit and a 16 kDa subunit. Protein sequencing data indicate that the larger of the two subunits is mature OP1 protein, the other is mature CBMP2A or CBMP2B. CBMP2B differs from CBMP2A at only five residues in the active region. Recombinant versions of both CBMP2A and CBMP2B are active cross species, either as homodimers or in combination with OP1 proteins. The recombinant data also indicates that the osteoinductive effect is not dependent on the presence of the entire mature form amino acid sequences of either subunit. Properly folded dimers comprising minimal structure, as short as 96 amino acids, are active. Furthermore, analogs of the active region, e.g., non-native forms never before known in nature, designed based on the observed homologies and known structure and properties of the native protein are capable of inducing bone formation. See, for example, COP5 and COP7 in U.S. Pat. No. 5,011,691. As far as applicants are aware, the biosynthetic constructs disclosed therein constitute the first instance of the design of a functional, active protein without preexisting knowledge of the active region of a native form nucleotide or amino acid sequence.

Further probing of mammalian cDNA libraries with sequences specific to hOP1 also have identified a sequence in mouse sharing almost complete identity with the mature hOP1 amino acid sequence (approximately 98% homology with OP1-18). Additional probing in both human and mouse cDNA and genomic libraries also has identified OP1-like sequences herein referred to as "OP2" ("hOP2" or "mOP2"). The OP2 proteins share significant amino acid sequence homology, approximately 74%, with the active region of the OP1 proteins (e.g., OP7), and less homology with the intact mature form (e.g., OP1-18Ser--58% amino acid homology). Table I lists the OP1 and OP2 species identified to date.

The amino acid sequence of the osteogenic proteins disclosed herein share significant homology with various regulatory proteins on which the consensus probe was modeled. In particular, the proteins share significant homology in their C-terminal sequences, which comprise the active region of the osteogenic proteins. (Compare, for example, OP7 with DPP from Drosophila and Vgl from Xenopus. See, for example, U.S. Pat. No. 5,011,691). Tn addition, these proteins share a conserved six or seven cysteine skeleton in this region (e.g., the linear arrangement of these C-terminal cysteine residues is conserved in the different proteins.) See, for example, OP7, whose sequence defines the seven cysteine skeleton, or OPS, whose sequence defines the six cysteine skeleton. In addition, the OP2 proteins contain an additional cysteine residue within this region.

                  TABLE I     ______________________________________     OP1, OP2 NOMENCLATURE     ______________________________________     hOP1    DNA sequence encoding human OP1 protein (Seq. ID No.             1 or 3). Also referred to in related applications as "OP1,"             "hOP-1" and "OP-1".     OP1     Refers generically to the family of osteogenically active             proteins produced by expression of part or all of the hOP1             gene. Also referred to in related applications as "OPI" and             "OP-1".     hOP1-PP Amino acid sequence of human OP1 protein (prepro form),             Seq. ID No. 1, residues 1-431. Also referred to in related             applications as "OP1-PP" and "OPP".     OP1-18Ser             Amino acid sequence of mature human OP1 protein, Seq.             ID No. 1, residues 293-431. N-terminal amino acid is             serine. Originally identified as migrating at 18 kDa on             SDS-PAGE in COS cells. Depending on protein glycosyla-             tion pattern in different host cells, also migrates at 23 kDa,             19 kDa and 17 kDa on SDS-PAGE. Also referred to in             related applications as "OP1-18."     OPS     Human OP1 protein species defining the conserved 6             cysteine skeleton in the active region (97 amino acids, Seq.             ID No. 1, residues 335-431.) "S" stands for "short".     OP7     Human OP1 protein species defining the conserved 7             cysteine skeleton in the active region (102 amino acids,             Seq. ID No. 1, residues 330-431).     OP1-16Ser             N-terminally truncated mature human OP1 protein species.             (Seq. ID No. 1, residues 300-431). N-terminal amino acid             is serine; protein migrates at 16 kDa or 15 kDa on SDS-             PAGE, depending on glycosylation pattern. Also referred to             in related applications as "OP-16S."     OP1-16Leu             N-terminally truncated mature human OP1 protein species,             Seq. ID No. 1, residues 313-431. N-terminal amino acid is             leucine; protein migrates at 16 or 15 kDa on SDS-PAGE,             depending on glycosylation pattern. Also referred to in             related applications as "OP-16L."     OP1-16Met             N-terminally truncated mature human OP1 protein species,             Seq. ID No. 1, residues 315-431. N-terminal amino acid is             methionine; protein migrates at 16 or 15 kDa on SDS-             PAGE, depending on glycosylation pattern. Also referred to             in related applications as "OP-16M."     OP1-16Ala             N-terminally truncated mature human OP1 protein species,             Seq. ID No. 1, residues 316-431. N-terminal amino acid is             alanine, protein migrates at 16 or 15 kDa on SDS-PAGE,             depending on glycosylation pattern. Also referred to in             related applications as "OP-16A."     OP1-16Val             N-terminally truncated mature human OP1 protein species,             Seq. ID No. 1, residues 318-431. N-terminal amino acid is             valine; protein migrates at 16 or 15 kDa on SDS-PAGE,             depending on glycosylation pattern. Also referred to in             related applications as "OP-16V."     mOP1    DNA encoding mouse OP1 protein, Seq. ID No. 24. Also             referred to in related applications as "mOP-1".     mOP1-PP Prepro form of mouse protein, Seq. ID No. 24, residues             1-430. Also referred to in related applications as             "mOP-1-PP."     mOP1-Ser             Mature mouse OP1 protein species (Seq. ID No. 24,             residues 292-430). N-terminal amino acid is serine. Also             referred to in related applications as "mOP1" and "mOP-1".     mOP2    DNA encoding mouse OP2 protein, Seq. ID No. 26. Also             referred to in related applications as "mOP-2".     mOP2-PP Prepro form of mOP2 protein, Seq. ID No. 26, residues             1-399. Also referred to in related applications as             "mOP-2-PP".     mOP2-Ala             Mature mouse OP2 protein, Seq. ID No. 26, residues             261-399. N-terminal amino acid is alanine. Also referred to             in related applications as "mOP2" and "mOP-2".     hOP2    DNA encoding human OP2 protein, Seq. ID No. 28. Also             referred to in related applications as "hOP-2".     hOP2-PP Prepro form of human OP2 protein, Seq. ID No. 28, res.             1-402). Also referred to in related applications as             "hOP-2-PP".     hOP2-Ala             Possible mature human OP2 protein species: Seq. ID No.             28, residues 264-402. Also referred to in related             applications as "hOP-2".     hOP2-Pro             Possible mature human OP2 protein species: Seq. ID NO.             28, residues 267-402. N-terminal amino acid is proline.             Also referred to in related applications as "hOP-2P."     hOP2-Arg             Possible mature human OP2 protein species: Seq. ID No.             28, res. 270-402. N-terminal amino acid is arginine. Also             referred to in related applications as "hOP-2R".     hOP2-Ser             Possible mature human OP2 protein species: Seq. ID No.             28, res. 243-402. N-terminal amino acid is serine. Also             referred to in related applications as "hOP-2S."     ______________________________________

The invention thus provides recombinant dimeric proteins comprising any of the polypeptide chains described above, as well as allelic variants, and naturally-occurring or biosynthetic mutants thereof, and osteogenic devices comprising any of these proteins. In addition, the invention is not limited to these specific constructs. Thus, the osteogenic proteins of this invention comprising any of these polypeptide chains may include forms having varying glycosylation patterns, varying N-termini, a family of related proteins having regions of amino acid sequence homology which may be naturally occurring or biosynthetically derived, and active truncated or mutated forms of the native amino acid sequence, produced by expression of recombinant DNA in procaryotic or eucaryotic host cells. Active sequences useful in an osteogenic device of this invention are envisioned to include osteogenic proteins having greater than 60% identity, preferably greater than 65% identity, with the amino acid sequence of OPS. This family of proteins includes longer forms of a given protein, as well as allelic variants and biosynthetic mutants, including addition and deletion mutants, such as those which may alter the conserved C-terminal cysteine skeleton, provided that the alteration still allows the protein to form a dimeric species having a conformation capable of inducing bone formation in a mammal when implanted in the mammal in association with a matrix. Particularly envisioned within the family of related proteins are those proteins exhibiting osteogenic activity and wherein the amino acid changes from the OPS sequence include conservative changes, e.g., those as defined by Dayoff, et al., Atlas of Protein Sequence and Structure; vol.5, Supp.3, pp.345-362, (M. O. Dayoff,ed. Nat'l Biomed. Research Fdn., Washington, D.C., 1979.)

The novel polypeptide chains and the osteogenic proteins they comprise can be expressed from intact or truncated cDNA or from synthetic DNAs in procaryotic or eucaryotic host cells, and then purified, cleaved, refolded, dimerized, and implanted in experimental animals. Useful host cells include E.coli, Saccharomyces, the insect/baculovirus cell system, myeloma cells and mammalian cells. Currently preferred procaryotic host cells include E. coli. Currently preferred eucaryotic host cells include mammalian cells, such as chinese hamster ovary (CHO) cells, or simian kidney cells (e.g., COS or BSC cells.) Thus, in view of this disclosure, skilled genetic engineers can isolate genes from cDNA or genomic libraries which encode appropriate amino acid sequences, modify existing sequences, or construct DNAs from oligonucleotides and then can express them in various types of procaryotic or eucaryotic host cells to produce large quantities of active proteins capable of inducing bone formation in mammals, including humans.

In one preferred aspect, the invention comprises dimeric osteogenic proteins and osteogenic devices containing these proteins, wherein the proteins comprise a polypeptide chain having an amino acid sequence sufficiently duplicative of the encoded amino acid sequence of Sequence ID No. 1 (hOP1) or 28 (hOP2) such that a dimeric protein comprising this polypeptide chain has a conformation capable of inducing endochondral bone formation when implanted in a mammal in association with a matrix. As used herein, the term "sufficiently duplicative" is understood to encompass all proteins capable of inducing endochondral bone formation when implanted in a mammal in association with a matrix and whose amino acid sequence comprises at least the conserved six cysteine skeleton and shares greater than 60% amino acid sequence identity in its active region with OPS.

In another preferred aspect, the invention comprises osteogenic proteins comprising species of polypeptide chains having the generic amino acid sequence herein referred to as "OPX" which accommodates the homologies between the various identified species of these osteogenic OP1 and OP2 proteins, and which is described by the amino acid sequence of Sequence ID No. 30.

The identification of mOP2 and hOP2 represents the discovery of osteogenic proteins having an additional cysteine residue in their active region in addition to the conserved six cysteine skeleton defined by OPS, or the conserved seven cysteine skeleton defined by OP7. Thus, in another aspect, the invention comprises species of polypeptide chains herein referred to as "OPX-7C", comprising the conserved six cysteine skeleton plus the additional cysteine residue identified in the OP2 proteins, and "OPX-8C", comprising the conserved seven cysteine skeleton plus the additional cysteine residue identified in the OP2 proteins. The OPX-7C and OPX-8C amino acid sequences are described in Seq. ID Nos. 31 and 32, respectively. Each Xaa in Seq. ID Nos. 31 and 32 independently represents one of the 20 naturally occurring L-isomer, ∝-amino acids or a derivative thereof which, together with the determined cysteine residues, define a polypeptide chain such that dimeric osteogenic proteins comprising this polypeptide chain have a conformation capable of inducing endochondral bone formation when implanted in a mammal in association with a matrix.

In still another preferred aspect, the invention comprises nucleic acids and the osteogenically active polypeptide chains encoded by these nucleic acids which hybridize to DNA or RNA sequences encoding the active region of OP1 or OP2 under stringent hybridization conditions. As used herein, stringent hybridization conditions are defined as hybridization in 40% formamide, 5×SSPE, 5×Denhardt's Solution, and 0.1% SDS at 37° C. overnight, and washing in 0.1×SSPE, 0.1% SDS at 50° C.

The invention further comprises nucleic acids and the osteogenically active polypeptide chains encoded by these nucleic acids which hybridize to the "pro" region of the OP1 or OP2 proteins under stringent hybridization conditions. As used herein, "osteogenically active polypeptide chains" is understood to mean those polypeptide chains which, when dimerized, produce a protein species having a conformation such that the pair of polypeptide chains is capable of inducing endochondral bone formation in a mammal when implanted in a mammal in association with a matrix.

The proteins of this invention, including fragments thereof, also may be used to raise monoclonal or polyclonal antibodies capable of binding specifically to an epitope of the osteogenic protein. These antibodies may be used, for example, in osteogenic protein purification protocols.

The osteogenic proteins are useful in clinical applications in conjunction with a suitable delivery or support system (matrix). As disclosed herein, the matrix may be combined with osteogenic protein to induce endochondral bone formation reliably and reproducibly in a mammalian body. The matrix is made up of particles of porous materials. The pores must be of a dimension to permit progenitor cell migration into the matrix and subsequent differentiation and proliferation. The particle size should be within the range of 70 μm-850 μm, preferably 70 μm-420 μm, most preferably 150 μm-420 μm. It may be fabricated by close packing particulate material into a shape spanning the bone defect, or by otherwise structuring as desired a material that is biocompatible, and preferably biodegradable in vivo to serve as a "temporary scaffold" and substratum for recruitment of migratory progenitor cells, and as a base for their subsequent anchoring and proliferation. Useful matrix materials comprise, for example, collagen; homopolymers or copolymers of glycolic acid, lactic acid, and butyric acid, including derivatives thereof; and ceramics, such as hydroxyapatite, tricalcium phosphate and other calcium phosphates. Combinations of these matrix materials also may be useful.

Currently preferred carriers include particulate, demineralized, guanidine extracted, species-specific (allogenic) bone, and specially treated particulate, protein extracted, demineralized, xenogenic bone. Optionally, such xenogenic bone powder matrices also may be treated with proteases such as trypsin. Preferably, the xenogenic matrices are treated with one or more fibril modifying agents to increase the intraparticle intrusion volume (porosity) and surface area. Useful agents include solvents such as dichloromethane, trichloroacetic acid, acetonitrile and acids such as trifluoroacetic acid and hydrogen fluoride.

The currently preferred fibril-modifying agent useful in formulating the matrices of this invention is a heated aqueous medium, preferably an acidic aqueous medium having a pH less than about pH 4.5, most preferably having a pH within the range of about pH 2-pH 4. A currently preferred heated acidic aqueous medium is 0.1% acetic acid which has a pH of about 3. Heating demineralized, delipidated, guanidine-extracted bone collagen in an aqueous medium at elevated temperatures (e.g., in the range of about 37° C.-65° C., preferably in the range of about 45° C.-60° C.) for approximately one hour generally is sufficient to achieve the desired surface morphology. Although the mechanism is not clear, it is hypothesized that the heat treatment alters the collagen fibrils, resulting in an increase in the particle surface area. Thus, one aspect of this invention includes osteogenic devices comprising matrices which have been treated to increase the surface area and porosity of matrix collagen particles substantially.

Examination of solvent-treated bone collagenous matrix shows that demineralized guanidine-extracted xenogenic bovine bone comprises a mixture of additional materials and that extracting these materials can improve matrix properties. Chromatographic separation of components in the extract, followed by addition back to active matrix of the various extract fractions corresponding to the chromatogram peaks, indicates that there is a fraction which can inhibit the osteoinductive effect. The identity of the substance or substances in this inhibiting fraction has not as yet been determined. Thus, in one aspect of this invention, a matrix is provided comprising treated Type-I bone collagen particles of the type described above, further characterized in that they are depleted in this inhibiting component.

In still another aspect of this invention, a matrix is provided that is substantially depleted in residual heavy metals. Treated as disclosed herein, individual heavy metal concentrations in the matrix can be reduced to less than about 1 ppm.

In view of this disclosure, one skilled in the art can create a biocompatible matrix of choice having a desired porosity or surface microtexture useful in the production of osteogenic devices, and useful in other implantable contexts, e.g., as a packing to promote bone induction, or as a biodegradable sustained release implant. In addition, synthetically formulated matrices, prepared as disclosed herein, may be used.

The osteogenic proteins and implantable osteogenic devices disclosed herein will permit the physician to obtain predictable bone formation to correct, for example, acquired and congenital craniofacial and other skeletal or dental anomalies (e.g., Glowacki et al. (1981) Lancet 1:959-963). The devices may be used to induce local endochondral bone formation in non-union fractures as demonstrated in animal tests, and in other clinical applications including dental and periodontal applications where bone formation is required. Another potential clinical application is in cartilage repair, for example, in the treatment of osteoarthritis.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects of the invention, the various features thereof, as well as the invention itself, may be more fully understood from the following description, when read together with the accompanying drawings, in which:

FIGS. 1A-1B are a flow diagram of a purification procedure for isolating osteogenic protein, illustrating purification steps from grinding cortical bone through lyophilization of guanidine-extracted material (1A), and urea solubilization through gel slicing (1B);

FIGS. 2A-2D are a collection of plots of protein concentration (as indicated by optical absorption) vs elution volume illustrating the results of bOP fractionation during purification on (2A) heparin-Sepharose-I; (2B) HAP-Ultragel; (2C) TSK 3000; and (2D) heparin-Sepharose-II. Asterisk identifies active peak;

FIGS. 3A-3B are a photographic reproduction of a Coomassie blue stained SDS polyacrylamide gel of the osteogenic protein under non-reducing (3A) and reducing (3B) conditions;

FIGS. 4A-4B are a photographic reproduction of a Con A blot of an SDS polyacrylamide gel showing the presence of a carbohydrate component in the oxidized (4A) and reduced (4B) 30 kDa protein;

FIGS. 5A-5D are photographic reproductions of autoradiograms of an SDS polyacrylamide gel of ¹²⁵ I-labelled osteogenic protein that is glycosylated and run under non-reducing conditions (5A); deglycosylated and run under non-reducing conditions (5B); glycosylated and run under reducing conditions (5C); deglycosylated and run under reducing conditions (5D);

FIGS. 6A-6E are a photographic reproduction of an autoradiogram of an SDS polyacrylamide gel of peptides produced upon the digestion of the 30 kDa osteogenic protein with V-8 protease (6B), Endo Lys C protease (6C), pepsin (6D), and trypsin (6E). (6A) is control;

FIGS. 7A-7C are a collection of HPLC chromatograms of tryptic peptide digestions of 30 kDa bOP (7A), the 16 kDa subunit (7B) and the 18 kDa subunit (7C);

FIG. 8 is an HPLC chromatogram of an elution profile on reverse phase C-18 HPLC of the samples recovered from the second heparin-Sepharose chromatography step (see FIG. 2D). Superimposed is the percent bone formation in each fraction;

FIG. 9 is a gel permeation chromatogram of an elution profile on TSK 3000/2000 gel of the C-18 purified osteogenic peak fraction. Superimposed is the percent bone formation in each fraction;

FIGS. 10A-10D are a collection of graphs of protein concentration (as indicated by optical absorption) vs. elution volume illustrating the results of human osteogenic protein fractionation on heparin-Sepharose I (10A), HAP-Ultragel (10B), TSK 3000/2000 (10C), and heparin-Sepharose II (10D). Arrows indicate buffer changes and asterisk identifies active peak;

FIG. 11 is a graph showing representative dose response curves for bone-inducing activity in samples from various purification steps including reverse phase HPLC on C-18 (A), heparin-Sepharose II (B), TSK 3000 (C),HAP-ultragel (D), and heparin-Sepharose I (E);

FIG. 12 is a bar graph of radiomorphometric analyses of feline bone defect repair after treatment with an osteogenic device (A), carrier control (B), and demineralized bone (C);

FIGS. 13A-13B are a schematic representation of the DNA sequence, restriction sites, and corresponding amino acid sequence of the consensus gene/probe for osteogenic protein as follows: (13A) nucleotides 1-192; (13B) nucleotides 193-314;

FIG. 14 is a graph of osteogenic activity vs. increasing molecular weight showing peak bone forming activity in the 30 kDa region of an SDS polyacrylamide gel;

FIG. 15 is a photographic representation of a Coomassie blue stained SDS gel showing gel purified subunits of the 30 kDa protein;

FIGS. 16A-16B are a pair of HPLC chromatograms of Endo Asp N proteinase digests of the trypsin-resistant cores from the 18 kDa subunit (16A) and the 16 kDa subunit (16B);

FIGS. 17A-17C are photographic representations of the histological examination of bone implants in the rat model: carrier alone (17A); carrier and glycosylated osteogenic protein (17B); and carrier and deglycosylated osteogenic protein (17C). Arrows indicate osteoblasts;

FIG. 18 is a representation of the hybridization of the consensus gene/probe to the OP1 gene;

FIGS. 19 A through 19 F are restriction maps of various expression vectors designed for the mammalian cell expression of OP1 as follows: (19A) vector pH717; (19B) vector pH731; (19C) vector pH754; (19D) vector pH752; (19E) vector pW24; (19F) vector pH783;

FIGS. 20A-20F are photoreproductions of Western blots (immunoblots) comparing OP1 expressed from pH717/COS cells (20A); pH731/COS cells (20B); pH754/CHO cells (20C); pH752/CHO cells; (20D); pH717/BSC cells (20E); and pW24/BSC cells (20F;

FIGS. 21A, 21B, 21C are elution profiles; FIGS. 21D, 21E, 21F are photo-reproductions of SDS-PAGE gels expressed from BSC cells and purified on S-Sepharaose, phenyl-sepharose and C-18 columns, respectively;

FIG. 22 is a photoreproduction of SDS-PAGE gels of OP1 purified from BSC cells, comparing the intact dimer under oxidized conditions (36 kDa, lane 1) and the corresponding monomer, after reduction with dithiothreitol (18 kDa, lane 5), with molecular weight standards (lanes 2-4);

FIGS. 23A-23E compare the amino acid sequences of the mature hOP1 and mOP1 polypeptide chains: OP1-18Ser and mOP1-Ser; and mature mOP2 and hOP2 polypeptide chains: hOP2-Ala and mOP2-Ala,as follows: (23A) residues 1-72 of hOP1-Ser, mOP1-Ser; (23B) residues 73-139 of hOP1-Ser, mOP1-Ser; (23C) residues 1-63 of hOP2-Ala, mOP2-Ala; (23D) residues 64-126 of hOP2-Ala, mOP2-Ala; (23E) residues 127-139 of hOP2-Ala, mOP2-Ala;

FIGS. 24A-24D compare the amino acid sequences of the mature OP1 and OP2 polypeptide chains: OP1-18Ser, mOP1-Ser, hOP2-Ala and mOP2-Ala as follows: (24A) residues 1-45; (24B) residues 46-90; (24C) residues 91-134; (24D) residues 135-139;

FIGS. 25A through 25D are scanning electron micrographs (approx. 1000×) of demineralized, delipidated bovine bone matrix heat treated in water at (25A) 37° C., (25B) 45° C., (25C) 55° C., and (25D) 65° C.;

FIGS. 26A and 26B are scanning electron micrographs (5000×) of demineralized, delipidated (26A) rat bone collagen particles, and (26B) bovine bone collagen particles;

FIG. 27 is a 214 nm absorbance tracing of the extract isolated from hot water-treated bovine matrix, identifying the inhibitory effect of individual fractions on in vivo bone formation;

FIGS. 28A and 28B are bar graphs showing the inhibitory effect of hot water-treated matrix extract on Op1 activity, as measured by (28A) alkaline phosphatase activity and (28B) calcium content in day 12 implants, vs. increasing concentration of extract solvent;

FIGS. 29A-29F are photomicrographs (220×) of allogenic implants of OP1-expressed from COS, BSC and CHO cells, as follows: (29A) control; (29B) 500 ng BSC-produced OP1; (29C) 220 ng COS-produced OP1; (29D) CHO-produced OP1, 220×; (29E) CHO-produced OP1, 440×; (29F) 500 ng BSC-produced OP1;

FIG. 30 is a photomicrograph showing the histology (day 12) of a xenogenic implant of this invention using OP1 expressed from BSC cells and hot water-treated xenogenic bovine matrix;

FIG. 31 describes the dose dependence of osteogenic implants for day 12 implants, as determined by alkaline phosphatase activity and calcium content, for allogenic implants containing OP1 expressed from COS, BSC and CHO cells;

FIGS. 32A and 32B are bar graphs showing the dose dependence of OP1 expressed in COS and BSC cells, as measured by (32A) alkaline phosphatase activity and (32B) calcium content in xenogenic implants (day 12), vs increasing concentration of protein (dose curve in ng); and

FIG. 33 compares the N-termini of the various forms of human OP1 protein identified to date.

DESCRIPTION

Purification protocols first were developed which enabled isolation of the osteogenic protein present in crude protein extracts from mammalian bone (e.g., from bovine bone, "bOP," and human bone. See U.S. Ser. No. 179,406 filed Apr. 8, 1988, now U.S. Pat. No. 4,968,590). Sequence data obtained from the bovine material suggested a probe design which was used to isolate human genes. The human counterpart osteogenic proteins have now been expressed and extensively characterized.

These discoveries have enabled preparation of DNAs encoding totally novel, non-native (e.g., not known to occur in nature) protein constructs which individually as homodimers and combined with other related species are capable of producing true endochondral bone (see U.S. Ser. No. 315,342, filed Feb. 23, 1989, now U.S. Pat. No. 5,011,691). They also permitted expression of the natural material, truncated forms, muteins, analogs, fusion proteins, and various other variants and constructs, from cDNAS and genomic DNAs retrieved from natural sources or from synthetic DNA produced using the techniques disclosed herein and using automated, commercially available equipment. The DNAs may be expressed using well established molecular biology and recombinant DNA techniques in procaryotic or eucaryotic host cells, and may be oxidized and refolded in vitro if necessary, to produce biologically active protein.

One of the DNA sequences isolated from human genomic and cDNA libraries encoded a previously unidentified gene, referred to herein as hOP1. The protein encoded by the isolated DNA was identified originally by amino acid homology with proteins in the TGF-β superfamily. Consensus splice signals were found where predicted amino acid homologies ended, designating exon-intron boundaries. Three exons were combined to obtain a functional TGF-β-like domain containing seven cysteines. (See, for example, U.S. Ser. No. 315,342 filed Feb. 23, 1989, now U.S. Pat. No. 5,011,691, and Ozkaynak, E. et al., (1990) EMBO. 9: pp. 2085-2093).

The full-length cDNA sequence for hOP1, and its encoded "prepro" form (hOP1-PP), which includes an N-terminal signal peptide sequence, are disclosed in Seq. ID No. 1 (residues 1-431). The mature form of hOP1 protein expressed in mammalian cells ("OP1-18Ser") is described by amino acid residues 293 to 431 of Seq. ID No. 1. The full length form of hOP1, as well as various truncated forms of the gene, and fusion DNA constructs, have been expressed in E. coli, and numerous mammalian cells as disclosed herein, and all have been shown to have osteogenic activity when implanted in a mammal in association with a matrix.

Given the foregoing amino acid and DNA sequence information, various DNAs can be constructed which encode at least the active region of the hOP1 protein (e.g., OPS or OP7), and various analogs thereof (including allelic variants and those containing genetically engineered mutations), as well as fusion proteins, truncated forms of the mature proteins, and similar constructs. Moreover, DNA hybridization probes can be constructed from fragments of the hOP1 DNA or designed de novo based on the hOP1 DNA or amino acid sequence. These probes then can be used to screen different genomic and cDNA libraries to identify additional genes encoding other osteogenic proteins.

The DNAs can be produced by those skilled in the art using well known DNA manipulation techniques involving genomic and cDNA isolation, construction of synthetic DNA from synthesized oligonucleotides, and cassette mutagenesis techniques. 15-100 mer oligonucleotides may be synthesized on a Biosearch DNA Model 8600 Synthesizer, and purified by polyacrylamide gel electrophoresis (PAGE) in Tris-Borate-EDTA buffer. The DNA then may be electroeluted from the gel. Overlapping oligomers may be phosphorylated by T4 polynucleotide kinase and ligated into larger blocks which may also be purified by PAGE.

DNAs used as hybridization probes may be labelled (e.g., as with a radioisotope, by nick-translation or by random hexanucleotide priming) and used to identify clones in a given library containing DNA to which the probe hybridizes, following techniques well known in the art. The libraries may be obtained commercially or they may be constructed de novo using conventional molecular biology techniques. Further information on DNA library construction and hybridization techniques can be found in numerous texts known to those skilled in the art. See, for example, F. M. Ausubel, ed., Current Protocols in Molecular Biology-Vol. I, John Wiley & Sons, New York, (1989). In particular, see Unit 5, "Construction of Recombinant DNA Libraries" and Unit 6, "Screening of Recombinant Libraries."

The DNA from appropriately identified clones then can be isolated, subcloned (preferably into an expression vector), and sequenced using any of a number of techniques well known in the art. Vectors containing sequences of interest then can be transfected into an appropriate host cell for protein expression and further characterization. The host may be a procaryotic or eucaryotic cell since the former's inability to glycosylate protein will not destroy the protein's osteogenic activity. Useful host cells include E. coli, Saccharomyces, the insect/baculovirus cell system, myeloma cells, and various other mammalian cells. The vector additionally may include various sequences to promote correct expression of the recombinant protein, including transcription promoter and termination sequences, enhancer sequences, preferred ribosome binding site sequences, preferred mRNA leader sequences, preferred signal sequences for protein secretion, and the like. The DNA sequence encoding the protein of interest also may be manipulated to remove potentially inhibiting sequences or to minimize unwanted secondary structure formation. The recombinant osteogenic protein also may be expressed as a fusion protein. After being translated, the protein may be purified from the cells themselves or recovered from the culture medium. All biologically active protein forms comprise dimeric species linked by disulfide bonds or otherwise associated, produced by oxidizing and refolding one or more of the various recombinant polypeptide chains within an appropriate eucaryotic cell or in vitro after expression of individual subunits. A detailed description of osteogenic protein purified from natural sources or expressed from recombinant DNA in E. coli and numerous different mammalian cells is disclosed below.

In view of this disclosure, and using standard immunology techniques well known in the art, those skilled in the art also may raise polyclonal or monoclonal antibodies against all or part of the polypeptide chains described herein. Useful protocols for antibody production may be found, for example, in Molecular Cloning--A Laboratory Manual (Sambrook et al., eds.) Cold Spring Harbor Press, 2nd ed., 1989). See Book 3, Section 18. The polypeptide chains useful as antigens may be purified from natural-sourced material, synthesized by chemical means, or expressed from recombinant nucleic acid as disclosed herein. Antibodies specific for the osteogenic proteins disclosed herein may be particularly useful in osteogenic protein preparation. For example, when purifying a given osteogenic protein from bone or a cell culture supernatant, the osteogenic protein may be selectively extracted from a mixture by exposing the mixture to the antibody under conditions such that the antibody specifically binds the osteogenic protein to form an antibody-osteogenic protein complex. This complex then may be separated from the mixture by conventional methods, and the complex dissociated to yield substantially purified osteogenic protein.

I. PURIFICATION OF OSTEOGENIC PROTEIN FROM BONE

A. BOVINE BONE

1. Purification

1.1 Preparation of Demineralized Bone

A schematic representation of the general protocol disclose herein for purifying osteogenic protein from bone is illustrated in FIG. 1. Demineralized bovine bone matrix is prepared by previously published procedures (Sampath and Reddi (1983) Proc. Natl. Acad. Sci. USA 80:6591-6595.). Bovine diaphyseal bones (age 1-10 days) are obtained from a local slaughterhouse and used fresh. The bones are stripped of muscle and fat, cleaned of periosteum, demarrowed by pressure with cold water, dipped in cold absolute ethanol, and stored at -20° C. They are then dried and fragmented by crushing and pulverized in a large mill. Care is taken to prevent heating by using liquid nitrogen. The pulverized bone is milled to a particle size between 70-420 μm and is defatted by two washes of approximately two hours duration with three volumes of chloroform and methanol (3:1). The particulate bone is then washed with one volume of absolute ethanol and dried over one volume of anhydrous ether. The defatted bone powder is then demineralized with 20 volumes of 0.5N HCl at 4° C. for 24 hours. The acid is removed every eight hours and fresh acid is added. Finally, the demineralized bone powder is washed with a large volume of water until the wash solution has a neutral pH. The water may be removed by freeze-drying.

1.2 Dissociative Extraction and Ethanol Precipitation

Demineralized bone matrix thus prepared is dissociatively extracted with 20 volumes of 4M guanidine-HCl, 50 mM Tris-HCl, pH 7.0, containing protease inhibitors (5 mM benzamidine, 0.1M 6-aminohexanoic acid, 5 mM N-ethylmaleimide, 0.5 mM phenylmethylsulfonylfluoride) for 16 hr. at 4° C. The suspension is filtered through cheese cloth and centrifuged at 20,000×g for 15 min. at 4° C. The supernatant is collected and concentrated to one volume using an Amicon ultrafiltration YM-10 hollow fiber membrane. The concentrate is centrifuged (40,000×g for 30 min. at 4° C.), and the supernatant is then subjected to ethanol precipitation. To one volume of concentrate is added seven volumes of cold (-20° C.) absolute ethanol (100%), which is then kept at -20° C. for 30 min. The precipitate is pelleted upon centrifugation at 10,000×g for 10 min. at 4° C. The resulting pellet is resuspended in 250 ml of 85% cold ethanol and recentrifuged. The pellet then is lyophilized.

1.3 Heparin-Sepharose Chromatography I

The ethanol precipitated, lyophilized, extracted crude protein is dissolved in 20 volumes of 6M urea, 50 mM Tris-HCl, pH 7.0 (Buffer A) containing 0.15M NaCl, and clarified by centrifugation at 20,000×g for 30 min. The supernatant is stirred for 15 min. with 50 volumes of hydrated heparin-Sepharose (Pharmacia) equilibrated with Buffer A containing 0.15M NaCl. The heparin-Sepharose is pre-treated with Buffer A containing 1.0M NaCl prior to equilibration. The unabsorbed protein is collected by packing the resin into a column. After washing with three column volumes of initial buffer (Buffer A containing 0.15M NaCl), protein is eluted with Buffer A containing 0.5M NaCl. The absorption of the eluate is monitored continuously at 280 nm. The pool of protein eluted by 0.5M NaCl (approximately 20 column volumes) is collected and stored at -20° C.

As shown in FIG. 2A, most of the protein (about 95%) remains unbound. Approximately 5% of the protein is bound to the column. The unbound fraction has no bone inductive activity when bioassayed as a whole or after a partial purification through Sepharose CL-6B.

1.4 Hydroxyapatite-Ultragel Chromatography

The volume of protein eluted by Buffer A containing 0.5M NaCl from the heparin-Sepharose is applied directly to a column of hydroxyapatite-Ultragel (HAP-Ultragel) (LKB Instruments), and equilibrated with Buffer A containing 0.5M NaCl. The HAP-Ultragel is treated with Buffer A containing 500 mM Na phosphate prior to equilibration. The unadsorbed protein is collected as an unbound fraction, and the column is washed with three column volumes of Buffer A containing 0.5M NaCl. The column subsequently is eluted with Buffer A containing 100 mM Na phosphate (FIG. 2B). The approximately 3 column volume pool of the protein peak eluted by 100 mM Na phosphate is concentrated using an Amicon ultrafiltration YM-10 membrane to one volume, dialysed in a 3.5 kDa molecular weight cut-off bag (Spectrapor) against distilled water, and lyophilized.

The 100 mM Na phosphate eluted component can induce endochondral bone as measured by alkaline phosphatase activity and histology (see section V.5.1, infra). As the biologically active protein is bound to HAP in the presence of 6M urea and 0.5M NaCl, it is likely that the protein has an affinity for bone mineral and may be displaced only by phosphate ions.

1.5 TSK 3000 Gel Exclusion Chromatography

Analytical TSK 3000 gel (silica gel), obtained from Bio Rad, is equilibrated with 4M guanidine-HCl, 50 mm Tris-HCl, pH 7.0. A pre-column (analytical) also is used. A portion of the lyophilized protein from HAP-Ultragel is dissolved in a known volume of 4M guanidine-HCl, 50 mM Tris-HCl, pH 7.0, and the solution is clarified by low speed centrifugation. A 200 μl sample containing approximately 10 mg of protein is loaded onto the column and then chromatographed with 4M guanidine-HCl, 50 mM Tris-HCl, pH 7.0, with a flow rate of 0.3 ml/min. 0.6 ml fractions are collected over 100 min., and the concentration of the protein is measured continuously at A₂₈₀. Fractions are collected and bioassayed as described below; fractions having a molecular weight less than 35 kDa (30-34 kDa) and osteoinductivity are pooled and stored at 4° C. (FIG. 2C).

1.6 Heparin-Sepharose Chromatography-II

The pooled osteo-inductive fractions obtained from TSK gel exclusion chromatography are dialysed extensively against distilled water and then against one liter of 6M urea, 50 mM Tris-HCl, pH 7.0 (Buffer A, also referred to in related applications as "Buffer B".) The dialysate then is cleared through centrifugation, and the supernatant is stirred for one hr. with 50-100 ml of hydrated heparin-Sepharose (Pharmacia) equilibrated with Buffer A. The heparin-Sepharose is pre-treated with Buffer A containing 1.0M NaCl prior to equilibration. The unadsorbed protein is collected by packing the resin into a column as an unbound fraction. After washing with three column volumes of initial buffer, the column is developed sequentially with Buffer A containing 0.1M NaCl, 0.15M NaCl, and 0.5M NaCl (see FIG. 2D). The protein eluted by 0.5M NaCl is collected and dialyzed extensively against distilled water. It then is dialyzed against one liter of 0.1% trifluoroacetic acid at 4° C.

1.7 Reverse Phase HPLC

The protein further is purified by C-18 Vydac silica-based HPLC column chromatography (particle size 5 μm; pore size 300 Å). The osteoinductive fraction obtained from heparin-Sepharose-II chromatograph is concentrated, loaded onto the column, and washed in 0.1% TFA, 10% acetonitrile for five min. The bound proteins are eluted with a linear gradient of 10-30% acetonitrile over 15 min., 30-50% acetonitrile over 60 min, and 50-70% acetonitrile over 15 min. at 22° C. with a flow rate of 1.0 ml/min, and 1.0 ml samples are collected in polycarbonate tubes. Protein is monitored by absorbance at 214 nm (see FIG. 8). Column fractions are tested for the presence of concanavalin A (Con A)-blottable 30 kDa protein and then pooled. Pools then are characterized biochemically for the presence of 30 kDa protein by autoradiography, concanavalin A blotting, and Coomassie blue dye staining. They are then assayed for in vivo osteogenic activity. Biological activity is not found in the absence of 30 kDa protein.

1.8 Gel Elution

The glycosylated or unglycosylated protein then is eluted from SDS gels for further characterization. ¹²⁵ I-labelled 30 kDa protein routinely is added to each preparation to monitor yields. TABLE 2 shows the various elution buffers that have been tested and the yields of ¹²⁵ I-labelled protein.

                  TABLE 2     ______________________________________     Elution of 30 kDa protein from SDS Gel                            % Eluted     Buffer                   0.5 mm  1.5 mm     ______________________________________     (1)  deionized H.sub.2 0     22     (2)  Guanidine-HCl, Tris-HCl, pH 7.0                                   2     (3)  Guanidine-HCl, Tris-HCl, pH 7.0, 0.5% Triton                                  93      52     (4)  0.1% SDS, Tris-HCl, pH 7.0                                  98     ______________________________________

TABLE 3 lists the steps used to isolate the 30 kDa or 27 kDa gel-bound protein. The standard protocol uses diffusion elution in Tris-HCl buffer containing 0.1% SDS to achieve greater than 95% elution of the protein from the 27 or 30 kDa region of the gel.

                  TABLE 3     ______________________________________     Preparation of Gel Eluted Protein     (C-18 Pool or deglycoslated protein plus .sup.125 I-labelled 30 kDa     protein)     ______________________________________     1.         Dry using vacuum centrifugation;     2.         Wash pellet with H.sub.2 O;     3.         Dissolve pellet in gel sample buffer (no reducing agent);     4.         Electrophorese on pre-electrophoresed 0.5 mm mini gel;     5.         Cut out 27 or 30 kDa protein;     6.         Elute from gel with 0.1% SDS, 50 mM Tris-HCl, pH 7.0;     7.         Filter through Centrex membrane;     8.         Concentrate in Centricon tube (10 kDa membrane);     9.         Chromatograph on TSK-3000 gel filtration column;     10.        Concentrate in Centricon tube.     ______________________________________

Chromatography in 0.1% SDS on a TSK-3000 gel filtration column is performed to separate gel impurities, such as soluble acrylamide, from the final product. The overall yield of labelled 30 kDa protein from the gel elution protocol is 50-60% of the loaded sample. Most of the loss occurs in the electrophoresis step, due to protein aggregation and/or smearing. In a separate experiment, a sample of gel eluted 30 kDa protein is reduced, electrophoresed on an SDS gel, and transferred to an Immobilon membrane. The membrane is stained with Coomassie blue dye, cut into slices, and the slices are counted. Coomassie blue dye stains the 16 kDa and 18 kDa reduced species almost exclusively. However, the counts showed significant smearing throughout the gel in addition to being concentrated in the 16 kDa and 18 kDa species. This suggests that the ¹²⁵ I-label can exhibit anomalous behavior on SDS gels and cannot be used as an accurate marker for cold protein under such circumstances.

The yield is 0.5 to 1.0 μg substantially pure osteogenic protein per kg of bone.

1.9 Isolation of the 16 kDa and 18 kDa Species

TABLE 4 summarizes the procedures involved in the preparation of the subunits. Gel eluted 30 kDa protein (FIG. 3) is carboxymethylated and electrophoresed on an SDS-gel. The sample contains ¹²⁵ I-label to trace yields and to use as an indicator for slicing the 16 kDa and 18 kDa regions from the gel. FIG. 15 shows a Coomassie stained gel of aliquots of the protein isolated from the different gel slices. The slices corresponding to the 16 kDa, 18 kDa and non-reducible 30 kDa species contained approximately 10 μg, 3-4 μg, and 6-8 μg, of protein respectively, as estimated by staining intensity. Prior to SDS electrophoresis, all of the 30 kDa species can be reduced to the 16 kDa and 18 kDa species. The non-reducible 30 kDa species observed after electrophoresis appears to be an artifact resulting from the electrophoresis procedure.

                  TABLE 4     ______________________________________     Isolation of the Subunits of the 30 kDa protein     (C-18 pool plus .sup.125 I-labeled 30 kDa protein)     ______________________________________     1.        Electrophorese on SDS gel.     2.        Cut out 30 kDa protein.     3.        Elute with 0.1% SDS, 50 mM Tris, pH 7.0.     4.        Concentrate and wash with H.sub.2 O in Centricon tube (10 kDa               membranes).     5.        Reduce and carboxymethylate in 1% SDS, 0.4M Tris, pH 8.5.     6.        Concentrate and wash with H.sub.2 O in Centricon tube.     7.        Electrophorese on SDS gel.     8.        Cut out the 16 kDa and 18 kDa subunits.     9.        Elute with 0.1% SDS, 50 mM Tris, pH 7.0.     10.       Concentrate and wash with H.sub.2 O in Centricon     ______________________________________               tubes.

2. Characterization of Natural-Sourced bOP

2.1 Molecular Weight and Structure

Electrophoresis of these fractions on non-reducing SDS polyacrylamide gels reveals a single band at about 30 kDa as detected by both Coomassie blue staining (FIG. 3A) and autoradiography.

In order to extend the analysis of bOP, the protein was examined under reducing conditions. FIG. 3B shows an SDS gel of bOP in the presence of dithiothreitol. Upon reduction, 30 kDa bOP yields two species which are stained with Coomassie blue dye: a 16 kDa species and an 18 kDa species. Reduction causes loss of biological activity. Methods for the efficient elution of the proteins from SDS gels have been tested, and a protocol has been developed to achieve purification of both proteins. The two reduced bOP species have been analyzed to determine if they are structurally related. Comparison of the amino acid composition of the two species (as disclosed below) shows little differences, indicating that the native protein may comprise two chains having some homology.

2.2 Charge Determination

Isoelectric focusing studies are carried out to further evaluate the 30 kDa protein for possible heterogeneity. The oxidized and reduced species migrate as diffuse bands in the basic region of the isoelectric focusing gel, using the iodinated 30 kDa protein for detection. Using two dimensional gel electrophoresis and Con A for detection, the oxidized 30 kDa protein shows a diffuse species migrating in the same basic region as the iodinated 30 kDa protein. The diffuse character of the band may be traced to the presence of carbohydrate attached to the protein.

2.3 Presence of Carbohydrate

The 30 kDa protein has been tested for the presence of carbohydrate by Con A blotting after SDS-PAGE and transfer to nitrocellulose paper. The results demonstrate that the 30 kDa protein has a high affinity for Con A, indicating that the protein is glycosylated (FIG. 4A). In addition, the Con A blots provide evidence for a substructure in the 30 kDa region of the gel, suggesting heterogeneity due to varying degrees of glycosylation. After reduction (FIG. 4B), Con A blots show evidence for two major components at 16 kDa and 18 kDa. In addition, it has been demonstrated that no glycosylated material remains at the 30 kDa regions after reduction.

In order to confirm the presence of carbohydrate and to estimate the amount of carbohydrate attached, the 30 kDa protein is treated with N-glycanase, a deglycosylating enzyme with a broad specificity. Samples of the ¹²⁵ I-labelled 30 kDa protein are incubated with the enzyme in the presence of SDS for 24 hours at 37° C. As observed by SDS-PAGE, the treated samples appear as a prominent species at about 27 kDa (FIG. 5B). Upon reduction, the 27 kDa species is reduced to species having a molecular weight of about 14 kDa-16 kDa (FIG. 5D).

Because the use of N-glycanase for producing deglycosylated protein samples for sequencing or biological activity testing is not advantageous, chemical cleavage of the carbohydrate moieties using hydrogen fluoride (HF) is performed.

Active osteogenic protein fractions pooled from the C-18 chromatography step are derived in vacuo over P₂ O₅ in a polypropylene tube, and 50 μl freshly distilled anhydrous HF at -70° C. is added. After capping the tube tightly, the mixture is kept at 0° C. in an ice-bath with. occasional agitation for 1 hr. The HF is then evaporated using a continuous stream of dry nitrogen gas. The tube is removed from the ice bath and the residue dried in vacuo over P₂ O₅ and KOH pellets.

Following drying, the samples are dissolved in 100 μl of 50% acetonitrile/0.1% TFA and aliquoted for SDS gel analysis, Con A binding, and biological assay. Aliquots are dried and dissolved in either SDS gel sample buffer in preparation for SDS gel analysis and Con A blotting, or 4M guanidine-HCl, 50 mM Tris-HCl, pH 7.0 for biological assay. The deglycosylated protein produces a bone formation response in the in vivo rat model described below as determined by histological examination (FIG. 17C).

The results show that samples are completely deglycosylated by the HF treatment: Con A blots after SDS gel electrophoresis and transfer to Immobilon membrane show no binding of Con A to the treated samples, while untreated controls are strongly positive at 30 kDa. Coomassie gels of treated samples show the presence of a 27 kDa band instead of the 30 kDa band present in the untreated controls.

2.4 Chemical and Enzymatic Cleavage

Cleavage reactions with CNBr are analyzed using Con A binding for detection of fragments associated with carbohydrate. Cleavage reactions are conducted using trifluoroacetic acid (TFA) in the presence and absence of CNBr. Reactions are conducted at 37° C. for 18 hours, and the samples are vacuum dried. The samples are washed with water, dissolved in SDS gel sample buffer with reducing agent, boiled and applied to an SDS gel. After electrophoresis, the protein is transferred to Immobilon membrane and visualized by Con A binding. In low concentrations of acid (1%), CNBr cleaves the majority of 16 kDa and 18 kDa species to one product, a species about 14 kDa. In reactions using 10% TFA, a 14 kDa species is observed both with and without CNBr.

Four proteolytic enzymes are used in these experiments to examine the digestion products of the 30 kDa protein: 1) V-8 protease; 2) Endo Lys C protease; 3) pepsin; and 4) tryspin. Except for pepsin, the digestion buffer for the enzymes is 0.1M ammonium bicarbonate, pH 8.3. The pepsin reactions are done in 0.1% TFA. The digestion volume is 100 μl and the ratio of enzyme to substrate is 1:10. ¹²⁵ I-labelled 30 kDa bOP is added for detection. After incubation at 37° C. for 16 hr., digestion mixtures are dried down and taken up in gel sample buffer containing dithiothreitol for SDS-PAGE. FIG. 6 shows an autoradiograph of an SDS gel of the digestion products. The results show that under these conditions, only trypsin digests the reduced 16 kDa/18 kDa species completely and yields a major species at around 12 kDa. Pepsin digestion yields better defined, lower molecular weight species. However, the 16 kDa/18 kDa fragments were not digested completely. The V-8 digest shows limited digestion with one dominant species at 16 kDa.

2.5 Protein Sequencing

To obtain amino acid sequence data, the protein is cleaved with trypsin. The tryptic digest of reduced and carboxymethylated 30 kDa protein (approximately 10 μg) is fractionated by reverse-phase HPLC using a C-8 narrowbore column (13 cm×2.1 mm ID) with a TFA/acetonitrile gradient and a flow rate of 150 μl/min. The gradient employs (A) 0.06% TFA in water and (B) 0.04% TFA in water and acetonitrile (1:4; v:v). The procedure is 10% B for five min., followed by a linear gradient for 70 min. to 80% B, followed by a linear gradient for 10 min. to 100% B. Fractions containing fragments as determined from the peaks in the HPLC profile (FIG. 7A) are rechromatographed at least once under the same conditions in order to isolate single components satisfactory for sequence analysis.

The HPLC profile of the similarly digested 16 kDa and 18 kDa subunits are shown in FIGS. 7B and 7C, respectively. These peptide maps are similar, suggesting that the subunits are identical or are closely related.

The tryspin resistant core material of the 16 kDa and 18 kDa subunits is digested with Endo Asp N proteinase. The core protein is treated with 0.5 μg Endo Asp N in 50 mM sodium phosphate buffer, pH 7.8 at 36° C. for 20 hr. Subsequently, the samples are centrifuged, and the water soluble peptides injected into the narrow bore HPLC. The water insoluble peptides also are subjected to HPLC fractionation after being dissolved in 50% acetonitrile/0.1% TFA. The conditions for fractionation are the same as those described previously for the 30 kDa, 16 kDa, and 18 kDa digests. The profiles obtained are shown in FIGS. 16A and 16B.

Various of the peptide fragments produced using the foregoing procedures have been analyzed in an automated amino acid sequencer (Applied Biosystems 450A). The following sequence data has been obtained:

(1) Ser-Phe-Asp-Ala-Tyr-Tyr-Cys-Ser-Gly-Ala-Cys-Gln-Phe-Pro-Met-Pro-Lys;

(2) Ser-Leu-Lys-Pro-Ser-Asn-Tyr-Ala-Thr-Ile-Gln-Ser-Ile-Val;

(3) Ala-Cys-Cys-Val-Pro-Thr-Glu-Leu-Ser-Ala-Ile-Ser-Met-Leu-Tyr-Leu-Asp-Glu-Asn-Glu-Lys;

(4) Met-Ser-Ser-Leu-Ser-Ile-Leu-Phe-Phe-Asp-Glu-Asn-Lys;

(5) Val-Gly-Val-Val-Pro-Gly-Ile-Pro-Glu-Pro-Cys-Cys-Val-Pro-Glu;

(6) Val-Asp-Phe-Ala-Asp-Ile-Gly

(7) Val-Pro-Lys-Pro; and

(8) Ala-Pro-Thr.

Several of the residues in these sequences could not be determined with certainty. For example, two amino acids join fragment 8 to the C-terminus of fragment 7. Initial sequencing data suggested these residues were both serines, but subsequent experiments identified the residues as cysteines. Accordingly, these data have been eliminated from the sequencing results presented here. Similarly, a spurious glutamic acid residue at the N-terminus of fragment 7, and a spurious lysine at the C-terminus of fragment 8 also have been eliminated from the data presented here (see U.S. Pat. No. 5,011,691, col. 7, fragment 7 for correct sequence).

Fragments 1,2 and 4-6 are described in the sequences presented in Seq. ID Nos. 20 and 22 (referred to herein as human and murine "CBMP3," respectively.) Specifically, fragment 1 is described essentially by residues 93-109 of Seq. ID No. 20 and fragment 2 is described essentially by residues 121-134 of Seq. ID No. 22 (note that residue 7 in fragment 2 is identified as a tyrosine. In Seq. ID No. 22 this residue is a histidine. By comparison with the CBMP2 and OP1 sequences, the correct residue likely is a histidine.) Fragment 4 is described essentially by residues 153-165 of Seq. ID No. 22 and fragment 5 is described essentially by residues 137-151 of Seq. ID No. 22 (note that residue 5 in fragment 5 is identified as a proline. In Seq. ID No. 22 this residue is a serine. By comparison with the CBMP2 and OP1 sequences, the correct residue likely is a serine.) Fragment 6 is described essentially by residues 77-83 of Seq. ID No. 20. Fragment 3 is described by residues 359-379 in the sequence presented in Seq. ID No. 4 (referred to herein as "CBMP2A"). Fragments 7 and 8 are described by residues 391-394 and 397-399, respectively, of the sequence presented in Seq. ID No.1 (referred to herein as "OP1".)

Subsequent additional peptide digest experiments performed on each of the two subunits purified from the highest activity fractions and digested with either thermolysin or endoproteinase Asp-N followed by endoproteinase Glu-C unequivocally identifies the 18 kDa subunit as comprising OP1, and the 16 kDa subunit as comprising CBMP2 (see U.S. Pat. No. 5,011,691 and Kuber Sampath et al., (1990) J. Biol. Chem. 265:13198-13205.)

Specifically, pyridylethylation of C-18 purified, reduced, bOP fractions showing the highest osteogenic activity, followed by separation by SDS-PAGE, gel slicing, elution, and digestion with endoproteinase Asp-N, then Staph V-8 protease, permitted separation of peptide fragments representative of each of the subunits from natural-sourced bovine material. Sequencing of the peptide fragments from the 18 kDa subunit yielded five sequences unequivocally from OP1. Sequencing of peptide fragments from the 16 kDa subunit yielded six sequences unequivocally from CBMP2A, and three that could have been from either CBMP2A or CBMP2B. The five sequences unequivocally from OP1 correspond to residue Nos. 341-345, 342-346, 346-352, 353-360 and 386-399 of Seq. ID No. 1. The six sequences unequivocally from CBMP2A correspond to residue Nos. 312-324, 312-330, 314-322, 323-330, 335-354 and 366-373 of Seq. ID No. 4. Another peptide, analyzed as Asp-Xaa-Pro-Phe-Pro-Leu, was consistent with the presence of CBMP2B. However, the amino terminal aspartic acid could have been a glutamic acid (Glu), in which case the peptide would have indicated the presence of CBMP2A. The Asp-Xaa-Pro-Phe-Pro-Leu sequence determination has not been repeated successfully. From these data, it is apparent that the active natural-sourced osteogenic protein comprises OP1 and CBMP2.

2.6 Amino Acid Analysis

Strategies for obtaining amino acid composition data were developed using gel elution from 15% SDS gels, transfer onto Immobilon, and hydrolysis. Immobilon membrane is a polymer of vinylidene difluoride and, therefore, is not susceptible to acid cleavage. Samples of oxidized (30 kDa) and reduced (16 kDa and 18 kDa) bOP are electrophoresed on a gel and transferred to Immobilon for hydrolysis and analysis as described below. The composition data generated by amino acid analyses of 30 kDa bOP is reproducible, with some variation in the number of residues for a few amino acids, especially cysteine and isoleucine.

Samples are run on 15% SDS gels, transferred to Immobilon, and stained with Coomassie blue. The bands of interest are excised from the Immobilon, with a razor blade and placed in a Corning 6×50 test tube cleaned by pyrolysis at 55° C. When cysteine is to be determined, the samples are treated with performic acid (PFA), which converts cysteine to cysteic acid. Cysteic acid is stable during hyrolysis with HCl, and can be detected during the HPLC analysis by using a modification of the normal Pico Tag eluents (Millipore) and gradient. The PFA is made by mixing 50 μl 30% hydrogen peroxide with 950 μl 99% formic acid, and allowing this solution to stand at room temperature for 2 hr. The samples then are treated with PFA as follows: 20 μl PFA is pipetted onto each sample and placed in an ice bath at 4° C. for 2.5 hours. After 2.5 hours, the PFA is removed by drying in vacuo, and the samples then are hydrolyzed. A standard protein of known composition and concentration containing cysteine is treated with PFA and hydrolyzed concurrently with the bOP samples.

The hydrolysis of the bOP samples is done in vacuo. The samples, with empty tubes and Immobilon blanks, are placed in a hydrolysis vessel which is placed in a dry ice/ethanol bath to keep the HCl from prematurely evaporating. 200 μl 6N HCl containing 2% phenol and 0.1% stannous chloride are added to the hydrolysis vessel outside the tubes containing the samples. The hydrolysis vessel is then sealed, flushed with prepurified nitrogen, evacuated, and then held at 115° C. for 24 hours, after which time the HCl is removed by drying in vacuo.

After hydrolysis, each piece of Immobilon is transferred to a fresh tube, where it is rinsed twice with 100 μl 0.1% TFA, 50% acetonitrile. The washings are returned to the original sample tube, which then is redried as below. A similar treatment of amino acid analysis on Immobilon can be found in the literature (LeGendre and Matsudaira (1988) Biotechniques 6:154-159).

The samples are redried twice using 2:2:1 ethanol:water:triethylamine and allowed to dry at least 30 min. after each addition of redry reagent. These redrying steps bring the sample to the proper pH for derivatization.

The samples are derivatized using standard methodology. The solution is added to each sample tube. The tubes are placed in a desiccator which is partially evacuated, and are allowed to stand for 20 min. The desiccator then is fully evacuated, and the samples are dried for at least 3 hr. After this step the samples may be stored under vacuum at -20° C. or immediately diluted for HPLC. The samples are diluted with Pico Tag Sample Diluent (generally 100 μl) and allowed to stand for 20 min., after which they are analyzed on HPLC using the Pico Tag chromatographic system with some minor changes involving gradients, eluents, initial buffer conditions and oven temperature.

After HPLC analysis, the compositions are calculated. The molecular weights are assumed to be 14.4 kDa, 16.2 kDa, and 27 kDa. The number of residues is approximated by dividing the molecular weight by the average molecular weight per amino acid, which is 115. The total picomoles of amino acid recovered is divided by the number of residues, and then the picomoles recovered for each amino acid is divided by the number of picomoles per residue, determined above. This gives an approximate theoretical number of residues of each amino acid in the protein. Glycine content may be overestimated in this type of analysis.

Composition data obtained are shown in TABLE 5.

                  TABLE 5     ______________________________________     bOP Amino Acid Analyses     Amino Acid 30 kDa       16 kDa  18 kDa     ______________________________________     Asp/Asn    22           14      15     Glu/Gln    24           14      16     Ser        24           16      23     Gly        29           18      26     His         5           *       4     Arg        13           6       6     Thr        11           6       7     Ala        18           11      12     Pro        14           6       6     Tyr        11           3       3     Val        14           8       7     Met         3           0       2     Cys**      16           14      12     Ile        15           14      10     Leu        15           8       9     Phe         7           4       4     Trp        ND           ND      ND     Lys        12           6       6     ______________________________________      *This result is not integrated because histidine is present in low      quantities.      **Cysteine is corrected by percent normally recovered from performic acid      hydrolysis of the standard protein.

The results obtained from the 16 kDa and 18 kDa subunits, when combined, closely resemble the numbers obtained from the native 30 kDa protein. The high figures obtained for glycine and serine are most likely the result of gel elution.

3. Demonstration That the 30 kDa Protein is osteogenic Protein

3.1 Gel Slicing

Gel slicing experiments confirm that the isolated 30 kDa protein is the protein responsible for osteogenic activity.

Gels from the last step of the purification are sliced. Protein in each fraction is extracted in 15 mM Tris-HCl, pH 7.0 containing 0.1% SDS. The extracted proteins are desalted, concentrated, and assayed for endochondral bone formation activity. The results are set forth in FIG. 14. Activity in higher molecular weight regions apparently is due to protein aggregation. These protein aggregates, when reduced, yield the 16 kDa and 18 kDa species discussed above.

3.2 Con A-Sepharose Chromatography

A sample containing the 30 kDa protein is solubilized using 0.1% SDS, 50 mM Tris-HCl, and is applied to a column of Con A-Sepharose equilibrated with the same buffer. The bound material is eluted in SDS Tris-HCl buffer containing 0.5M alpha-methyl mannoside. After reverse phase chromatography of both the bound and unbound fractions, Con A-bound materials, when implanted, result in extensive bone formation (see Sections III-V, infra, for assay methodologies). Further characterization of the bound materials show a Con A-blottable 30 kDa protein. Accordingly, the 30 kDa glycosylated protein is responsible for the bone forming activity.

3.3 Gel Permeation Chromatography

TSK-3000/2000 gel permeation chromatography in guanidine-HCl is used to achieve separation of the high specific activity fraction obtained from C-18 chromatography (FIG. 9). The results demonstrate that the peak of bone inducing activity elutes in fractions containing substantially pure 30 kDa protein by Coomassie blue staining. When this fraction is iodinated and subjected to autoradiography, a strong band at 30 kDa accounts for 90% of the iodinated proteins. The fraction induces bone formation in vivo at a dose of 50 to 100 ng per implant.

3.4 Structural Requirements for Biological Activity

Although the role of 30 kDa bOP is clearly established for bone induction, through analysis of proteolytic cleavage products we have begun to search for a minimum structure that is necessary for activity in vivo. The results of cleavage experiments demonstrate that pepsin treatment fails to destroy bone inducing capacity, whereas trypsin or CNBr completely abolishes the activity.

An experiment is performed to isolate and identify pepsin digested product responsible for biological activity. Samples used for pepsin digestion were 20%-30% pure. The buffer used is 0.1% TFA in water. The enzyme to substrate ratio is 1:10. A control sample is made without enzyme. The digestion mixture is incubated at room temperature for 16 hr. The digested product then is separated in 4M guanidine-HCl using gel permeation chromatography, and the fractions are prepared for in vivo assay. The results demonstrate that active fractions from gel permeation chromatography of the pepsin digest correspond to molecular weight of 8 kDa-10 kDa.

In order to understand the importance of the carbohydrates moiety with respect to osteogenic activity, the 30 kDa protein has been chemically degylcosylated using HF. After analyzing an aliquot of the reaction product by Con A blot to confirm the absence of carbohydrate, the material is assayed for its activity in vivo. The bioassay is positive (i.e., the deglycosylated protein produces a bone formation response as determined by histological examination shown in FIG. 17C), demonstrating that exposure to HF did not destroy the biological function of the protein. In addition, the specific activity of the deglycosylated protein is approximately the same as that of the native glycosylated protein.

B. Human Bone

Human bone is obtained from the Bone Bank, (Massachusetts General Hospital, Boston, Mass.), and is milled, defatted, demarrowed and demineralized by the procedure disclosed above. 320 g of mineralized milled bone yields 70-80 g of demineralized milled bone. Dissociative extraction and ethanol precipitation of the demineralized milled bone gives 12.5 g of guanidine-HCl extract.

One third of the ethanol precipitate (0.5 g) is used for gel filtration through 4M guanidine-HCl (FIG. 10A). Approximately 70-80 g of ethanol precipitate per run is used. In vivo bone inducing activity is localized in the fractions containing proteins in the 30 kDa range. They are pooled and equilibrated in 6M urea, 0.5M NaCl buffer, and applied directly onto an HAP column; the bound protein is eluted stepwise by using the same buffer containing 100 mM and 500 mM phosphate (FIG. 10B). Bioassay of HAP bound and unbound fractions demonstrates that only the fraction eluted by 100 mM phosphate has bone inducing activity in vivo. The biologically active fraction obtained from HAP chromatography is subjected to heparin-Sepharose affinity chromatography in buffer containing low salt; the bound proteins are eluted by 0.5M NaCl (FIG. 10D. FIG. 10C describes the elution profile for the intervening gel filtration step described above). Assaying the heparin-Sepharose fractions shows that the bound fraction eluted by 0.5M NaCl has bone-inducing activity. The active fraction then is subject to C-18 reverse phase chromatography.

The active fraction subsequently can be subjected to SDS-PAGE as noted above to yield a band at about 30 kDa comprising substantially pure human osteogenic protein.

II. NOVEL OSTEOGENIC SEQUENCES

A. OP1

1. DNA Sequence Identification and Characterization

These discoveries enable preparation of DNAs encoding totally novel, non-native (e.g., not known to occur in nature) protein constructs which individually as homodimers and combined with other related species, possibly as heterodimers, are capable of producing true endochondral bone. They also permit expression of the natural material, truncated forms, muteins, analogs, fusion proteins, and various other variants and constructs, from cDNAs and genomic DNAs retrieved from natural sources or from synthetic DNA produced using the techniques disclosed herein and automated, commercially available equipment. The DNAs may be expressed using well established recombinant DNA technologies in procaryotic or eucaryotic host cells, or in cell-free systems, and may be oxidized and refolded in vitro if necessary for biological activity.

More specifically, a synthetic consensus gene shown in Seq. ID No. 33 and FIG. 18, was designed as a hybridization probe (see U.S. Pat. No. 4,968,590, filed Apr. 8, 1988.) The design was based on amino acid sequence data obtained by sequencing digestion fragments of naturally sourced material and on predictions from observed homologies of these sequences with members of the TGF-β gene family. The consensus gene/probe exploited human codon bias as found in human TGF-β. The designed sequence then was constructed using known assembly techniques for oligonucleotides manufactured in a DNA synthesizer. Table 6, below, shows the identified homologies between tryptic peptides derived from bOP and amino acid sequences from Drosophila DPP protein (as inferred from the gene) and the Xenopus Vgl protein, both of which show strong homology with the bOP peptides, and TGF-beta and inhibin, which share somewhat less homology with the bOP peptides.

                  TABLE 6     ______________________________________     protein  amino acid sequence                                 homology     ______________________________________     (bOP)    SFDAYYCSGACQFPS       ***** * * **              (9/15 matches)     (DPP)    GYDAYYCHGKCPFFL     (bOP)    SFDAYYCSGACQFPS                 * ** * *  *     (6/15 matches)     (Vgl)    GYMANYCYGECPYPL     (bOP)    SFDAYYCSGACQFPS                 * ** * *        (5/15 matches)     (inhibin)              GYHANYCEGECPSHI     (bOP)    SFDAYYCSGACQFPS                 *  * * *        (4/15 matches)     (TGF-β1)              GYHANFCLGPCPYIW     (bOP)    K/RACCVPTELSAISMLYLDEN                  *****  * ****  * *                                 (12/20 matches)     (Vgl)    LPCCVPTKMSPISMLFYDNN     (bOP)    K/RACCVPTELSAISMLYLDEN               *  ***** *   **** *                                 (12/20 matches)     (inhibin)              KSCCVPTKLRPMSMLYYDDG     (bOP)    K/RACCVPTELSAISMLYLDEN                ******* *    ****                                 (12/20 matches)     (DPP)    KACCVPTQLDSVAMLYLNDQ     (bOP)    K/RACCVPTELSAISMLYLDE                  ****  *      * (6/19/ matches)     (TGF-β1)              APCCVPQALEPLPIVYYVG     (bOP)    LYVDF              *****              (5/5/ matches)     (DPP)    LYVDF     (bOP)    LYVDF              *** *              (4/5 matches)     (Vgl)    LYVEF     (bOP)    LYVDF              ** **              (4/5 matches)     (TGF-β1)              LYIDF     (bOP)    LYVDF                * *              (2/4 matches)     (inhibin)              FFVSF     ______________________________________     *-match

In addition to its function as a probe, the consensus sequence also was designed to act as a synthetic consensus gene for the expression of a consensus osteogenic protein.

In determining the amino acid sequences of a consensus osteogenic protein from which the nucleic acid sequence can be determined, the following points are considered: (1) the amino acid sequence determined by Edman degradation of osteogenic protein tryptic fragments is ranked highest as long as it has a strong signal and shows homology or conservative changes when aligned with the other members of the gene family; (2) where the sequence matches for all four proteins, it is used in the synthetic gene sequence; (3) matching amino acids in DPP and Vgl are used; (4) If Vgl or DPP diverged but either one is matched by TGF-beta or by inhibin, this matched amino acid is chosen; (5) where all sequences diverge, the DPP sequence is initially chosen, with a later plan of creating the Vgl sequence by mutagenesis kept as a possibility. In addition, the consensus sequence is designed to preserve the disulfide crosslinking and the apparent structural homology. Finally, as more amino acid sequences of osteogenic proteins become available, the consensus gene can be improved to match, using known methods of site-directed mutagenesis. In the process, a family of. analogs can be developed (see, for example, U.S. Pat. No. 5,011,691, filed Feb. 23, 1989).

A human genomic library (Maniatis-library) carried in lambda phage (Charon 4A) was screened using the probe and the following hybridization conditions: hybridizing in 5×SSPE, 10×Denhardt's Solution, 0.5% SDS at 50° C. and washing in 1×SSPE, 0.5% SDS at 50° C. Twenty-four positive clones were found. Five contained a gene encoding a protein never before reported, designated OP1, osteogenic protein-1, described below. Two others yielded genes corresponding to the BMP-2B protein, and one yielded a gene corresponding to the BMP3 protein (see PCT US 87/01537).

Southern blot analysis of lambda #13 DNA showed that an approximately 3 kb BamHI fragment hybridized to the probe (see nucleotides 1036-1349 of Seq. ID No. 3, and FIG. 18). This fragment was isolated and subcloned. Analysis of this sequence showed that the fragment encoded the carboxyl terminus of a protein, herein named OP1. The protein was identified by amino acid homology with the TGF-β family. Consensus splice signals were found where amino acid homologies ended, designating exon-intron boundaries. Three exons were combined to obtain a functional TGF-β-like domain containing seven cysteines. The DNA sequence of the functional domain then was used as a probe to screen a human cDNA library as described below.

The hOP1 probe was labeled with ³² P and used to screen a human placenta 5' stretch lambda phage cDNA library (Clontech, Palo Alto, Calif.), and a human hippocampus library (Stratagene, Inc., La Jolla, Calif.), using high stringency hybridization conditions. Positive clones obtained from these libraries yielded a full length cDNA (translated region) for hOP1. This cDNA sequence, and the amino acid sequence it encodes, is set forth in Seq. ID No. 1. The partial genomic DNA sequence for the human OP1 gene is listed in Seq. ID No. 3. The protein coding region is encoded in seven exons separated by six introns in the genomic sequence (see Seq. ID No. 3.) It is possible that, as has been found in certain other mammalian genes, one or more of the introns may include sequences having a transcription regulatory function.

The native form protein is expressed originally as an immature translation product referred to herein as a "prepro" form which includes a signal peptide sequence necessary for appropriate secretion of the protein. Removal of the signal peptide yields the "pro" form of the protein, which is processed further to yield the mature secreted protein. Referring to Table I and Seq. ID No. 1, the amino acid sequence of the prepro form of OP1 (herein referred to as hOP1-PP) is described by residues 1-431. The amino acid residues 26 to 30 of Seq. ID No. 1 are believed to constitute a cleavage site for the removal of the N-terminal residues, constituting the signal peptide. Residues 289-292 of Seq ID No. 1 represent the pertinent Arg-Xaa-Xaa-Arg sequence where the pro form is believed to be cut to produce the mature form (e.g., cleavage occurs between residues 292 and 293.) Both the pro form and the prepro form, when properly dimerized, folded, adsorbed on a matrix, and implanted, display osteogenic activity, presumably due to proteolytic degradation resulting in cleavage ana generation of mature form protein or active truncated analogs. (See Section II.A.2, infra). Mature OP1 contains 3 potential N glycosylation sites; there is an additional site in the precursor region.

The genomic clone lambda #18 DNA was found to contain the complete sequence encoding the protein referred to herein as CBMP2B. The DNA sequence corresponds to the sequence termed human BMP-2 Class II ("BMP4") in PCT U.S. 87/01537. The CBMP2(b) gene consists of two exons. Exon 1 is approximately 0.37 kb and exon 2 (containing the TGF-β domain) is about 0.86 kb. The two exons are interrupted by an approximately 1 kb intron. Following the methodology used to identify the hOP1 cDNA, the coding sequence of the genomic CBMP2(b) clone was used as a probe to clone the full-length CBMP2(b) cDNA from a human placenta 5'-stretch cDNA library (Clontech, Palo Alto.) This cDNA sequence, and the predicted amino acid sequence it encodes, are set forth in Seq. ID No. 6.

The cDNA encoding the protein referred to herein as CBMP2A was cloned using the CBMP2(b) cDNA as a probe. The murine homolog first was cloned from a murine cDNA library and a portion of this cDNA sequence then used as a probe to clone the human CBMP2(a) cDNA from a human hippocampus cDNA library (Stratagene, Inc., LaJolla) and a human fetal lung library. Each of these human cDNA libraries yielded partial length clones which were then fused to yield the full length CBMP2(a) cDNA clone. The DNA sequence for CBMP2(a), and its predicted encoded amino acid sequence, are set forth in Seq. ID No. 4. The DNA sequence corresponds to the sequence termed human BMP-2 Class I ("BMP2") in PCT U.S. 87/101537.

The amino acid sequence corresponding to the conserved six cysteine skeleton in the active region of CBMP2B is described by amino acid residues 313 to 408 of Seq. ID No. 6 (herein referred to as "CBMP2BS" where "S" refers to "short form.") Similarly, the corresponding amino acid sequene of CBMP2A ("CBMP2AS") is described by amino acid residues 301 to 396 of Seq. ID No. 4.

Longer sequences defining the seven cysteine skeleton, are "CBMP2AL" (residues 296 to 396 of ID No. 4), and "CBMP2BL" (residues 308 to 408 of ID No. 6), where "L" refers to "long form."

Seq. ID Nos. 4 and 6 describe the human cDNA sequences for CBMP2(a) and CBMP2(b), respectively, as well as the encoded full-length, "prepro" forms of these proteins. Using the prediction methods devised by Von Heijne ((1986) Nucleic Acids Research 14:4683-4691), residues 20-24 indicate the region for the presumed signal peptide cleavage site for CBMP2A (Seq. ID No. 4), and residues 23-24 of Seq. ID No. 6 indicate the presumed cleavage site for CBMP2B. The cleavage site yielding the mature sequence of CBMP2A is believed to occur within the region described by residues 271-282 of ID No. 4; and within the region described by residues 280-292 of Seq. ID No. 6 for CBMP2B, although there remains uncertainty regarding where precise cleavage occurs for this protein. Finally, the CBMP2 proteins contain 4 or 5 potential glycosylation sites.

The consensus probe also identified a human genomic clone encoding a protein referred to herein as CBMP3. The DNA sequence corresponds to the sequence termed human BMP3 in PCT U.S. 87/01357. A partial genomic sequence encoding part of the mature region of the CBMP3 protein is set forth in Seq. ID No. 20. Using the same general methodology as described for the cloning of the CBMP2B cDNA sequences, the murine cDNA encoding CBMP3 was cloned ("mCBMP3.") The cDNA encoding the mature region of this protein, and the encoded amino acid sequence, are set forth in Seq. ID No. 22.

Given the foregoing amino acid and DNA sequence information, various DNAs can be constructed which encode at least a minimal sequence encoding the active domain of OP1 and/or CBMP2, and various analogs thereof, as well as fusion proteins, truncated forms of the mature proteins, and similar constructs. Both the pro form and the prepro form are active, presumably because of in situ cleavage events or generation of active products by cleavage during protein processing. These DNAs can be produced by those skilled in the art using well known DNA manipulative techniques involving genomic and cDNA isolation, construction of synthetic DNA from synthesized oligonucleotides, and cassette mutagenesis techniques. 15-100 mer oligonucleotides may be synthesized on a Biosearch DNA Model 8600 Synthesizer, and purified by polyacrylamide gel electrophoresis (PAGE) in Tris-Borate-EDTA buffer. The DNA then is electroeluted from the gel. Overlapping oligomers may be phosphorylated by T4 polynucleotide kinase and ligated into larger blocks which may also be purified by PAGE.

The cDNA or synthetic DNA then may be integrated into an expression vector and transfected into an appropriate host cell for protein expression. Because both the glycosylated and unglycosylated protein are active, the host may be a procaryotic or eucaryotic cell. Useful host cells include E. coli, Saccharomyces, the insect/baculovirus cell system, myeloma cells, and various other mammalian cells. The proteins of this invention preferably are expressed in mammalian cells, as disclosed herein. The vector additionally may include various sequences to promote correct expression of the recombinant protein, including transcription promoter and termination sequences, enhancer sequences, preferred ribosome binding site sequences, preferred mRNA leader sequences, preferred protein processing sequences, preferred signal sequences for protein secretion, and the like. The DNA sequence encoding the gene of interest also may be manipulated to remove potentially inhibiting sequences or to minimize unwanted secondary structure formation. The recombinant osteogenic protein also may be expressed as a fusion protein. After being translated, the protein may be purified from the cells themselves or recovered from the culture medium. All biologically active protein forms comprise dimeric species joined by disulfide bonds or otherwise associated, produced by oxidizing and refolding one or more of the various recombinant proteins within an appropriate eucaryotic cell or in vitro after expression of individual subunits.

2. Expression in E. coli

Using such techniques, various fusion genes can be constructed to induce recombinant expression of osteogenic sequences in a procaryotic host such as E. coli. In particular, the following DNAs have been prepared:

    ______________________________________     Fusion DNA Sequences                      Osteogenic Fusion Proteins     ______________________________________     OP1 (a)          OP1A      (Seq. ID No. 8)     OP1 (b)          OP1B      (Seq. ID No. 10)     OP1 (c)          OP1C      (Seq. ID No. 12)     OP1 (d)          OP1D      (Seq. ID No. 14)     CBMP2b1          CBMP2B1   (Seq. ID No. 16)     CBMP2b2          CBMP2B2   (Seq. ID No. 18)     ______________________________________

Construct OP1(a) is a cDNA sequence encoding substantially all of the mature form of OP1 (residues 326-431, Seq. ID No. 1) linked by an Asp-Pro acid cleavage site to a leader sequence ("MLE leader", amino acid residues 1-60 of Seq. ID No. 8) suitable for promoting expression in E. coli. OP1(b) (Seq. ID No. 10) encodes a truncated "pro" form of OP1. The sequence comprises the MLE leader linked to an OP1 sequence which begins within the precursor ("prepro") sequence (beginning at residue 176 of Seq. ID No. 1). OP1(c) comprises an MLE leader peptide (residues 1-53 of Seq. ID No. 12) linked to the full prepro form of OP1 cDNA including the presumed signal peptide (e.g., residues 1-29 of Seq. ID No. 1). OP1(d) comprises a leader sequence ("short TRP," residues 1-13 of Seq. ID No. 14), an Asp-Pro cleavage site, and the presumed entire pro form of the OP1 protein (residues 39-431 of Seq. ID No. 1). CBMP2b1 (Seq. ID No. 16) comprises the MLE leader (residues 1-56, Seq. ID No. 16) linked through an Asp-Pro acid cleavage site to substantially all of the mature form of CBMP2B (residues 296-408 of Seq. ID No. 6). Approximately one half of this construct comprised cDNA; the other half was synthesized from oligonucleotides. CBMP2b2 comprises the MLE leader (residues 1-60 of ID No. 18) linked to substantially all of the full length pro form of CBMP2B (residues 52-408 of Seq. ID No. 6).

The genes were expressed in E. coli under the control of a synthetic trp promoter-operator to produce insoluble inclusion bodies. The inclusion bodies were solubilized in 8M urea following lysis, dialyzed against 1% acetic acid, and partly purified by differential solubilization. Constructs containing the Asp-Pro site were cleaved with acid. The resulting products were passed through a Sephacryl-200HR or SP Trisacyl column to further purify the proteins, and then subjected to HPLC on a semi-prep C-18 column to separate the leader proteins and other minor impurities from the OP1, or CBMP2 constructs. Both the CBMP2 and OP1 proteins may be purified by chromatography on heparin-Sepharose. The output of the HPLC column was lyophilized at pH 2 so that it remains reduced.

Conditions for refolding were at pH 8.0 using Tris buffer and 6M guanidine-HCl at a protein concentration of several mg/ml. Those solutions were diluted with water to produce a 2M or 3M guanidine concentration and left for 18 hours at 4° C. Air dissolved or entrained in the buffer assures oxidation of the protein in these circumstances.

Samples of the various purified constructs and various mixtures of pairs of the constructs refolded together were applied to SDS polyacrylamide gels, separated by electrophoresis, sliced, incorporated in a matrix as disclosed below, and tested for osteogenic activity. These studies demonstrated that each of the constructs disclosed above have true osteogenic activity. Thus, both the pro form and prepro form, when properly dimerized, folded, adsorbed on a matrix, and implanted, display osteogenic activity, presumably due to proteolytic degradation resulting in cleavage and generation of mature form protein or active truncated species. In addition, mixed species also are osteogenically active and may include heterodimers. Specific combinations tested include: OP1A-CBMP2B1, OP1B-CMP2B1, and OP1C-CBMP2B2. Finally, single and mixed species of analogs of the active region, e.g., COP5 and COP7, disclosed in U.S. Pat. No. 5,011,691, also induce osteogenesis, as determined by histological examination.

After N-terminal sequencing of the various constructs to confirm their identity, polyclonal antisera against the recombinant presumed mature form proteins were produced. The human OP1 antisera reacted with both the glycosylated and unglycosylated higher molecular weight subunits of naturally sourced bovine material. Antisera against recombinant mature human CBMP2 reacted with both the glycosylated and unglycosylated lower molecular weight subunit of naturally sourced bovine material. While there was some cross-reactivity, this was expected in view of the significant homology between CBMP2 and OP1 (approx. 60% identity), and the likelihood that degraded OP1 generated during purification contaminates the lower molecular weight subunit. Both antisera react with the naturally sourced 30 kDa dimeric bOP.

3. Mammalian Cell Expression

As stated earlier, it is generally held that recombinant production of mammalian proteins for therapeutic uses are preferably expressed in mammalian cell culture systems in order to produce a protein whose structure is most like that of the natural material. Recombinant protein production in mammalian cells requires the establishment of appropriate cells and cell lines that are easy to transfect, are capable of stably maintaining foreign DNA with an unrearranged sequence, and which have the necessary cellular components for efficient transcription, translation, post-translation modification, and secretion of the protein. In addition, a suitable vector carrying the gene of interest also is necessary. DNA vector design for transfection into mammalian cells should include appropriate sequences to promote expression of the gene of interest as described supra, including appropriate transcription initiation, termination, and enhancer sequences, as well as sequences that enhance translation efficiency, such as the Kozak consensus sequence. Preferred DNA vectors also include a marker gene and means for amplifying the copy number of the gene of interest.

Substantial progress in the development of mammalian cell expression systems has been made in the last decade and many aspects of the system are well characterized. A detailed review of the state of the art of the production of foreign proteins in mammalian cells, including useful cells, protein expression-promoting sequences, marker genes, and gene amplification methods, is disclosed in Bendig, Mary M., (1988) Genetic Engineering 7:91-127.

Briefly, among the best characterized transcription promoters useful for expressing a foreign gene in a particular mammalian cell are the SV40 early promoter, the adenovirus promoter (AdMLP), the mouse metallothionein-I promoter (mMT-I), the Rous sarcoma virus (RSV) long terminal repeat (LTR), the mouse mammary tumor virus long terminal repeat (MMTV-LTR), and the human cytomegalovirus major intermediate-early promoter (hCMV). The DNA sequences for all of these promoters are known in the art and are available commercially.

One of the better characterized methods of gene amplification in mammalian cell systems is the use of the selectable DHFR gene in a dhfr- cell line. Generally, the DHFR gene is provided on the vector carrying the gene of interest, and addition of increasing concentrations of the cytotoxic drug methotrexate leads to amplification of the DHFR gene copy number, as well as that of the associated gene of interest. DHFR as a selectable, amplifiable marker gene in transfected chinese hamster ovary cell lines (CHO cells) is particularly well characterized in the art. Other useful amplifiable marker genes include the adenosine deaminase (ADA) and glutamine synthetase (GS) genes.

In the currently preferred expression system, gene amplification is further enhanced by modifying marker gene expression regulatory sequences (e.g., enhancer, promoter, and transcription or translation initiation sequences) to reduce the levels of marker protein produced. As disclosed herein, lowering the level of DHFR transcription has the effect of increasing the DHFR gene copy number (and the associated OP1 gene) in order for a transfected cell to adapt to grow in even low levels of MTX (e.g., 0.1 μM MTX). Preferred expression vectors (pH754 and pH752), have been manipulated using standard recombinant DNA technology, to create a weak DHFR promoter (see infra). As will be appreciated by those skilled in the art, other useful weak promoters, different from those disclosed and preferred herein, can be constructed using standard vector construction methodologies. In addition, other, different regulatory sequences also can be modified to achieve the same effect.

The choice of cells/cell lines is also important and depends on the needs of the experimenter. Monkey kidney cells (COS) provide high levels of transient gene expression, providing a useful means for rapidly testing vector construction and the expression of cloned genes. COS cells are transfected with a simian virus 40 (SV40) vector carrying the gene of interest. The transfected COS cells eventually die, thus preventing the long term production of the desired protein product. However, transient expression does not require the time consuming process required for the development of a stable cell line.

Among established cell lines, CHO cells may be the best characterized to date, and are the currently preferred cell line for mammalian cell expression of recombinant osteogenic protein. CHO cells are capable of expressing proteins from a broad range of cell types. The general applicability of CHO cells and its successful production for a wide variety of human proteins in unrelated cell types emphasizes the underlying similarity of all mammalian cells. Thus, while the glycosylation pattern on a recombinant protein produced in a mammalian cell expression system may not be identical to the natural protein, the differences in oligosaccharide side chains are often not essential for biological activity of the expressed protein.

Methods for expressing and purifying recombinant osteogenic proteins such as OP1 from a variety of mammalian cells, the nature of the xenogenic matrix, and other material aspects concerning the nature, utility, and how to make and how to use the subject matter claimed will be further understood from the following, which constitutes the best method currently known for practicing the invention. The methodology disclosed herein includes the use of COS cells for the rapid evaluation of vector construction and gene expression, and the use of established cell lines for long term protein production. Of the cell lines disclosed, OP1 expression from CHO cell lines currently is most preferred.

3.1 Recombinant Protein Expression In Mammalian Cells

Several different mammalian cell expression systems have been used to express recombinant OP1 proteins of this invention. In particular, COS cells are used for the rapid assessment of vector construction and gene expression, using an SV40 vector to transfect the DNA sequence into COS cells. Stable cell lines are developed using CHO cells (chinese hamster ovary cells) and a temperature-sensitive strain of BSC cells (simian kidney cells, BSC40-tsA58, (1988) Biotechnology 6: 1192-1196) for the long term production of OP1. Two different promoters were found most useful to transcribe hOP1: the CMV promoter and the MMTV promoter, boosted by the enhancer sequence from the Rous sarcoma virus LTR. The mMT promoter (mouse metallothionein promoter) and the SV40 late promoter also have been tested. Several selection marker genes also are used, namely, neo (neomycin) and DHFR. The DHFR gene also may be used as part of a gene amplification scheme for CHO cells. Another gene amplification scheme relies on the temperature sensitivity (ts) of BSC40-tsA58 cells transfected with an SV40 vector. Temperature reduction to 33° C. stabilizes the ts SV40 T antigen which leads to the excision and amplification of the integrated transfected vector DNA, thereby also amplifying the associated gene of interest.

Stable cell lines were established for CHO cells as well as BSC40-tsA58 cells (hereinafter referred to as "BSC cells"). The various cells, cell lines and DNA sequences chosen for mammalian cell expression of the OP1 proteins of this invention are well characterized in the art and are readily available. Other promoters, selectable markers, gene amplification methods and cells also may be used to express the OP1 proteins of this invention, as well as other osteogenic proteins. Particular details of the transfection, expression, and purification of recombinant proteins are well documented in the art and are understood by those having ordinary skill in the art. Further details on the various technical aspects of each of the steps used in recombinant production of foreign genes in mammalian cell expression systems can be found in a number of texts and laboratory manuals in the art, such as, for example, F. M. Ausubel et al., ed., Current Protocols in Molecular Biology, John Wiley & Sons, New York, (1989.)

3.2 Exemplary Expression Vectors

FIG. 19 (A-F) discloses restriction maps of various exemplary expression vectors designed for OP1 expression in mammalian cells. Each of these vector constructs employs a full-length hOP1 cDNA sequence originally isolated from a human cDNA library (human placenta) and subsequently cloned into a conventional pUC vector (pUC-18) using pUC polylinker sequences at the insertion sites. The hOP1 cDNA fragment cloned into each of these constructs is either the intact SmaI-BamHI hOP1 cDNA fragment (nucleotides 26-1385 of Seq. ID No. 1), or modifications of this fragment where the flanking non-coding 5' and/or 3' sequences have been trimmed back, using standard molecular biology methodology. Each vector also employs an SV40 origin of replication (ori), useful for mediating plasmid replication in primate cells (e.g., COS and BSC cells). In addition, the early SV40 promoter is used to drive transcription of marker genes on the vector (e.g., neo and DHFR). It will be appreciated by those skilled in the art that DNA sequences encoding truncated forms of the osteogenic protein also may be used, provided that the expression vector or host cell then provides the sequences necessary to direct processing and secretion of the expressed protein.

The pH717 expression vector (FIG. 19A) contains the neomycin (neo) gene as a selection marker. This marker gene is well characterized in the art and is available commercially. Alternatively, other selectable markers may be used. The particular vector used to provide the neo gene DNA fragment for pH717 may be obtained from Clontech, Inc., Palo Alto, Calif. (pMAM-neo-blue). This vector also may be used as the backbone. In pH717, hOP1 DNA transcription is driven by the CMV promoter, boosted by the RSV-LTR and MMTV-LTR (mouse mammary tumor virus) enhancer sequences. These sequences are known in the art, and are available commercially. For example, vectors containing the CMV promoter sequence may be obtained from Invitrogen Inc., San Diego, Calif., (e.g., pCDM8).

Expression vector pH731 (FIG. 19B), utilizes the SV40 late promoter to drive hOP1 transcription. As indicated above, the sequence and characteristics of this promoter also are well known in the art. For example, pH731 may be generated by inserting the SmaI-BamHI fragment of hOP1 into pEUK-C1 (Clontech, Inc., Palo Alto, Calif.).

The pH752 and pH754 expression vectors contain the DHFR gene, under SV40 early promoter control, as both a selection marker and as an inducible gene amplifier. The DNA sequence for DHFR is well characterized in the art, and is available commercially. For example, pH754 may be generated from PMAM-neo (Clontech, Inc., Palo Alto, Calif.) by replacing the neo gene (BamHI digest) with an SphI-BamHI, or a PvuII-BamHI fragment from pSV5-DHFR (ATCC #37148), which contains the DHFR gene under SV40 early promoter control. A BamHI site can be engineered at the SphI or PvuII site using standard techniques (e.g., by linker insertion or site-directed mutagenesis) to allow insertion of the fragment into the vector backbone. hOP1 DNA can be inserted into the polylinker site downstream of the MMTV-LTR sequence (mouse mammary tumor virus LTR), yielding pH752 (FIG. 19D). The CMV promoter sequence then may be inserted into pH752 (e.g., from pCDM8, Invitrogen,Inc.), yielding pH754 (FIG. 19C.) The SV40 early promoter, which drives DHFR expression, is modified in these vectors to reduce the level of DHFR mRNA produced. Specifically, the enhancer sequences and part of the promoter sequence have been deleted, leaving only about 200 bases of the promoter sequence upstream of the DHFR gene. Host cells transfected with these vectors are adapted to grow in 0.1 μM MTX and can increase OP1 production significantly (see Table 8).

The pW24 vector (FIG. 19E), is essentially identical in sequence to p754, except that neo is used as the marker gene (see pH717), in place of DHFR.

Similarly, pH783 (FIG. 19F) contains the amplifiable marker DHFR, but here OP1 is under mMT (mouse metallothionein promoter) control. The mMT promoter is well characterized in the art and is available commercially.

All vectors tested are stable in the various cells used to express OP1, and provide a range of OP1 expression levels.

3.3 Exemplary Mammalian Cells

Recombinant OP1 has been expressed in three different cell expression systems: COS cells for rapidly screening the functionality of the various expression vector constructs, CHO cells for the establishment of stable cell lines, and BSC40-tsA58 cells as an alternative means of producing OP1 protein. The CHO cell expression system disclosed herein is contemplated to be the best mode currently known for long term recombinant OP1 production in mammalian cells.

a) COS Cells

COS cells (simian kidney cells) are used for rapid screening of vector constructs and for immediate, small scale production of OP1 protein. COS cells are well known in the art and are available commercially. The particular cell line described herein may be obtained through the American Type Culture Collection (ATCC #COS-1, CRL-1650).

OP1 expression levels from different vectors, analyzed by Northern and Western blot assays, are compared in Table 7 below:

                  TABLE 7     ______________________________________     ANALYSIS OF OP1 EXPRESSION IN COS CELLS     Vector       mRNA        OP1 Production     ______________________________________     pH717        +++         ++     pH731        +           +     pH752        +++         ++++     pH754        +++         ++++     ______________________________________

pH752- and pH754-transfected COS cells appear to produce the highest yield of OP1 to date. However, because transfected COS cells do not divide and die several days post-transfection, large amounts of plasmid DNA are required for each scaled up transformation.

Large scale preparations of OP1 from transfected COS cells may be produced using conventional roller bottle technology. Briefly, 14×10⁶ cells are used to seed each bottle. After 24 hrs of growth, the cells are transfected with 10 μg of vector DNA (e.g., pH717) per 10⁶ cells, using the DEAE-dextran method. Cells are then conditioned in serum-free media for 120 hr before harvesting the media for protein analysis. Following this protocol, OP1 yield is approximately 2-6 ng/ml.

b) BSC Cells

The BSC40-tsA58 cell line ("BSC cells") is a temperature-sensitive strain of simian kidney cells ((1988), Biotechnology 6: 1192-1196) which overcomes some of the problems associated with COS cells. These BSC cells have the advantage of being able to amplify gene sequences rapidly on a large scale with temperature downshift, without requiring the addition of exogenous, potentially toxic drugs. In addition, the cells may be recycled. That is, after induction and stimulation of OP1 expression, the cells may be transferred to new growth medium, grown to confluence at 39.5° C. and induced a second time by downshifting the temperature to 33° C. BSC cells may be used to establish stable cell lines rapidly for protein production.

OP1 expression in transfected BSC cells may be induced by shifting the temperature down to 33° C., in media containing 10% FCS, and harvesting the conditioned media after 96 hrs of incubation. Comparable amounts of OP1 mRNA and protein are obtained, as compared with CHO cells (e.g., 100-150 ng OP1/ml conditioned media from BSC clones transfected with pH717, see infra).

c) CHO Cells

CHO cells (chinese hamster ovary cells) may be used for long term OP1 production and are the currently preferred cell line for mammalian cell expression of OP1. CHO cell lines are well characterized for the small and large scale production of foreign genes and are available commercially. The particular cell line described herein is CHO-DXB11, (Lawrence Chasin, Columbia University, NY). Table 8, below, shows exemplary OP1 yields obtained with a variety of expression vectors.

                  TABLE 8     ______________________________________                           Selection                                    OP1 Production     CHO Cells  Plasmid    Marker   ng/ml     ______________________________________                pH717      NEO      2-5     *          pH752/pH754                           DHFR     100-150     ______________________________________      *Cells are adapted to grow in 0.1 μM methotrexate

CHO cells may be transfected by conventional calcium phosphate technique. CHO cells preferably are transfected with pH754 or pH752 and are conditioned in media containing serum proteins, as this appears to enhance OP1 yields. Useful media includes media containing 0.1-0.5% dialyzed fetal calf serum (FCS).

The currently preferred best mode for establishing a stable OP1 production cell line with high hOP1 expression levels comprises transfecting a stable CHO cell line, preferably CHO-DXB11, with the pH752 OP1 expression vector, isolating clones with high OP1 expression levels, and subjecting these clones to cycles of subcloning using a limited dilution method described below to obtain a population of high expression clones. Subcloning preferably is performed in the absence of MTX to identify stable high expression clones which do not require addition of MTX to the growth media for OP1 production.

In the subcloning protocol cells are seeded on ten 100 mm petri dishes at a cell density of either 50 or 100 cells per plate, with or preferably without MTX in the culture media. After 14 days of growth, clones are isolated using cloning cylinders and standard procedures, and cultured in 24-well plates. Clones then are screened for OP1 expression by Western immunoblots using standard procedures, and OP1 expression levels compared to parental lines. Cell line stability of high expression subclones then is determined by monitoring OP1 expression levels over multiple cell passages (e.g., four or five passages).

3.4 Evaluation of OP1 transfected cells

Expression levels of transfected OP1 sequences can be measured in the different systems by analyzing mRNA levels (Northern blots), using total cellular RNA and conventional hybridization methodology. Generally, about 1×10⁶ cells are needed for mRNA analysis. Data between individual cell lines can be compared if the total number of cells and the total amount of mRNA is normalized, using rRNA as an internal standard. Ribosomal RNA is visualized in the agarose gel by ethidium bromide stain prior to transfer of the RNA to nitrocellulose sheets for hybridization. Ribosomal RNA also provides an indicator of the integrity of the RNA preparation.

OP1 protein levels also may be measured by Western blots (immunoblots) using rabbit antisera against human OP1. FIG. 20 is an immunoblot showing OP1 production in: COS cells--(20A) pH717, (20B) pH731; CHO cells--(20C) pH754, (20D) pH752; and BSC cells--(20E) pH717 and (20F) pW24.

Southern blots may be used to assess the state of integrated OP1 sequences and the extent of their copy number amplification. The copy number of excised plasmids in temperature-shifted BSC cells also can be determined using Southern blot analysis.

3.5 Protein Purification

The purification scheme developed to purify the recombinant osteogenic proteins of this invention is rapid and highly effective. The protocol involves three chromatographic steps (S-Sepharose, phenyl-Sepharose and C-18 HPLC), and produces OP1 of about 90% purity.

For a typical 2L preparation of transfected BSC cells conditioned in 0.5% FCS, the total protein is 700 mg. The amount of OP1 in the media, estimated by Western blot, is about 80 μg. OP1 media is diluted to 6M urea, 0.05M NaCl, 13 mM HEPES, pH 7.0 and loaded onto an S-Sepharose column, which acts as a strong cation exchanger. OP1 binds to the column in low salt, and serum proteins are removed. The column is subsequently developed with two step salt elutions. The first elution (0.1M NaCl) removes contaminants and approximately 10% of the bound OP1. The remaining 90% of OP1 then is eluted in 6M urea, 0.3M NaCl, 20 mM HEPES, pH 7.0.

Ammonium sulfate is added to the 0.3M NaCl fraction to obtain final solution conditions of 6M urea, 1M (NH₄)₂ SO₄, 0.3M NaCl, 20 mM HEPES, pH 7.0. The sample then is loaded onto a phenyl-Sepharose column (hydrophobic interaction chromatography). OP1 binds phenyl-Sepharose in the presence of high concentrations of a weak chaotropic salt (e.g., 1M (NH₄)₂ SO₄). Once OP1 is bound, the column is developed with two step elutions using decreasing concentrations of ammonium sulfate. The first elution (containing 0.6M (NH₄)₂ SO₄) primarily removes contaminants. The bound OP1 then is eluted with a 6M urea, 0.3M NaCl, 20 mM HEPES, pH 7.0 buffer containing no ammonium sulfate.

The OP1 eluted from the phenyl-Sepharose column is dialyzed against water, followed by 30% acetonitrile (0.1% TFA), and then applied to a C-18 reverse phase HPLC column. FIGS. 21A, (21C) and (21E) are chromatograms and FIGS. 21B, 21D and 21F are Coomassie-stained SDS-PAGE gels of fractions after reduction with dithiothreitol (DTT) eluting from the (21A, 21D) S-Sepharose, (21B, 21E) phenyl-Sepharose, and (21C, 21E) C-18 columns. Gel separation of oxidized and reduced OP1 samples show that the reduced subunit has an apparent molecular weight of about 18 kDa, and the dimer has an apparent molecular weight of about 36 kDa, as illustrated in FIG. 22. The subunit size appears to be identical to that purified from COS cells, as well as that of the naturally-sourced OP purified from bone. This purification protocol yields about 30 μg of OP1 for 2 L of conditioned media, a recovery of about 25% of the total OP1 in the conditioned media, as estimated by gel scanning.

An alternative chromatography protocol is to perform the S-Sepharose chromatography in the absence of 6M urea. The bound proteins then are eluted with salt step elutions (e.g., 100-400 mM NaCl). Most of the OP1 is eluted with about 300 mM NaCl. Additional OP1 then can be eluted with 300 mM NaCl in the presence of 6M urea. The 6M urea elution also may be used in place of the non-urea elution to achieve maximum recovery in one step. In addition, OP1 may be eluted from the phenyl-Sepharose column in 38% ethanol-0.01% TFA, thereby eliminating the need to dialyze the eluent before applying it to the C-18 column. Finally, multiple C-18 columns may be used (e.g., three), to further enhance purification and concentration of the protein.

OP1 also will bind hydroxyapatite efficiently, but only in the absence of 6M urea and at low phosphate concentrations (less than 5 mM phosphate). Bound OP1 can be removed from the column with a step elution of 1 mM to 0.5M phosphate (in 0.5M NaCl, 50 mM Tris, pH 7.0). OP1 elutes at about 250 mM phosphate. Additionally, urea (6M) may be added during the elution step.

Other related chromatography methods also may be useful in purifying OP1 from eucaryotic cell culture systems. For example, heparin-Sepharose may be used in combination with the S-Sepharose column. Alternatively, Cu²⁺ -immobilized metal-ion affinity chromatography (IMAC) will bind OP1 in a phosphate buffer (pH 7.0) containing 6M urea.

3.6 Protein Characterization

Recombinant osteogenic protein expression in COS cells yields essentially a single species having an apparent molecular weight of 18 kDa, as determined by SDS-PAGE analysis. Subsequent N-terminal sequencing data indicates that this species contains the intact mature OP1 sequence, referred to herein as "OP1-18Ser" ("Ser Thr Gly . . . ", beginning at residue 293 of Seq. ID No.1.) Both the BSC and CHO preparations, by contrast, contain both the intact mature sequence and one or more active degraded species.

BSC cell-derived preparations yield two major species having an apparent molecular weight of about 18 kDa and 16 kDa, and a minor species of about 23 kDa as determined by SDS-PAGE analysis. N-terminal sequencing of the two major species using standard techniques reveals that the 18 kDa species, like the COS-derived OP1 protein, contains the intact mature form of OP1 (OP1-18Ser). The 16 kDa fraction appears to contain five species of the mature sequence, having different N-termini. One form, "OP1-16Ser," has its N-terminus at +8 of the mature sequence ("Ser Gln Asn . . . ", beginning at residue 300 of Seq. ID No.1.) A second species, referred to herein as "OP1-16Leu", has its N-terminus at +21 of the mature sequence ("Leu Arg Met . . . ", beginning at residue 313 of Seq. ID No. 1). A third and fourth species, referred to herein as OP1-16Met and OP1-16Ala, have their N-termini at +23 and +24, respectively, of the mature OP1 sequence. (See Seq. ID No.1: OP1-16Met begins at residue 315, "Met Ala Asn . . . ", and OP1-16Ala begins at residue 316, "Ala Asn Val . . . ".) Finally, a fifth degraded species has its N-terminus at +26 of the mature sequence ("Val Ala Glu . . . ", beginning at residue 318 of Seq. ID No. 1) and is referred to herein as "OP1-16Val." The various species are listed in Table 1 and their N-termini are presented in FIG. 33. Biochemical analyses and in vivo bioassays indicate all species are active (see infra). Preliminary sequencing data of the minor species migrating at 23 kDa suggests that this species also contains the mature active sequence. Accordingly, the protein's altered mobility on an electrophoresis gel may be due to an altered glycosylation pattern.

Similarly, CHO-derived OP1 preparations generally produce three species having an apparent molecular weight within the range of 15-20 kDa, as determined by SDS-PAGE (specifically, 19 kDa, 17 kDa, and 15 kDa). A minor species also migrates at about 23 kDa. N-terminal and C-terminal sequencing (by CNBr analysis) of proteins in the different fractions reveals that CHO expression produces the same species of OP1 proteins as produced by BSC cell expression, but having different electrophoretic mobility on an SDS polyacrylamide gel. Both the 19 kDa and the 17 kDa protein fractions contain the intact mature form of OP1 (OP1-18Ser) and the OP1-16Ser degraded form. Preliminary sequencing data of the 23 kDa species suggest that this species also contains the intact mature form of OP1. Finally, N-terminal sequencing of the protein species migrating at 15 kDa indicates that proteins in this fraction contain the other four degraded forms of OP1 identified in the BSC cell system: OP1-16Leu, OP1-16Met, OP1-16Ala and OP1-16Val. These data suggest that the apparent molecular weight differences among the various OP1 species detected may be due primarily to variations in their glycosylation patterns. In addition, protein glycosylation pattern variations are a known characteristic of CHO expression systems. In vivo bioassays of all OP1 species detected indicate that all truncated forms are active (see infra).

The glycosylation patterns of the proteins in the various OP1 preparations can be investigated by measuring their reactivity with different lectins, using standard methodologies. Here, reactivity with Concanavalin A (Con A), which binds to the mannose core region, and Wheat Germ Agglutinin (WGA), which binds to N-acetyl glucosamine (GlcNAc) and sialic acid (SA) residues, was measured. Results indicate that there may be substantial variation among the glycosylation patterns of the various OP1 species. Con A reacts strongly with both the CHO-derived 17 kDa species and the BSC-derived 16 and 18 kDa species, but only weakly with the other species. Conversely, WGA reacts strongly only with the 19 kDa and 23 kDa CHO-derived species and the 18 and 23 kDa BSC-derived proteins. These results further suggest that variations in the electrophoretic migration patterns of the various OP1 preparations reflect variations in protein glycosylation patterns, which appear to be host cell-specific characteristics.

The various different OP1 preparations also have been analyzed by standard HPLC chromatography. Preparations of OP1 from both CHO and BSC cells have very similar characteristics by HPLC analysis in oxidized, reduced, pyridylethylated or degraded forms. Although distinct by SDS-PAGE analysis, the differences between the different cell type preparations appear insufficient to influence the binding to HPLC C-18 columns.

Accordingly, as will be appreciated by those skilled in the art, it is anticipated that active mature OP1 sequences can be expressed from other different procaryotic and eucaryotic cell expression systems as disclosed herein. The proteins produced may have varying N-termini, and those expressed from eucaryotic cells may have varying glycosylation patterns. Finally, it will also be appreciated that these variations in the recombinant osteogenic protein produced will be characteristic of the host cell expression system used rather than of the protein itself.

B. Identification of Additional, Novel Osteogenic Sequences

In an effort to identify additional DNA sequences encoding osteogenic proteins, a hybridization probe specific to the DNA sequence encoding the C-terminus of the mature OP1 protein was prepared using a StuI-EcoRl digest fragment of hOP1 (base pairs 1034-1354 in Seq. ID No. 1), and labelled with ³² P by nick translation, as described in the art. As disclosed supra, applicants have previously shown that the OP1 C-terminus encodes a key functional domain e.g., the "active region" for osteogenic activity (OPS or OP7). The C-terminus also is the region of the protein whose amino acid sequence shares specific amino acid sequence homology with particular proteins in the TGF-β super-family of regulatory proteins and which includes the conserved cysteine skeleton.

Approximately 7×10⁵ phages of an oligo (dT) primed 17.5 days p.c. mouse embryo 5' stretch cDNA (gt10) library (Clontech, Inc., Palo Alto, Calif.) was screened with the labelled probe. The screen was performed using the following hybridization conditions: 40% formamide, 5×SSPE, 5×Denhardt's Solution, 0.1% SDS, at 37° C. overnight, and washing in 0.1×SSPE, 0.1% SDS at 50° C. Where only partial clones were obtained, the complete gene sequence was subsequently determined by screening either a second cDNA library (e.g., mouse PCC4 cDNA (ZAP) library, Stratagene, Inc., La Jolla, Calif.), or a mouse genomic library (e.g., Clontech, Inc., Palo, Alto, Calif.).

Five recombinant phages were purified over three rounds of screening. Phage DNA was prepared from all five phages, subjected to an EcoRl digest, subcloned into the EcoRl site of a common pUC-type plasmid modified to allow single strand sequencing, and sequenced using means well known in the art.

Two different mouse DNA sequences, referred to herein as mOP1 and mOP2, were identified by this procedure. The characteristics of the proteins encoded by these sequences are described below.

1. mOP1.

mOP1 is the murine homolog of hOP1. The cDNA and encoded amino acid sequence for the full length mOP1 protein is depicted in Sequence ID No. 24. The full-length form of the protein is referred to as the prepro form of mOP1 ("mOP1-PP"), and includes a signal peptide sequence at its N-terminus. The amino acid sequence Ser-Ala-Leu-Ala-Asp (amino acid residues 26-30 in Seq. ID No. 24) is believed to constitute the cleavage site for the removal of the signal peptide sequence, leaving an intermediate form of the protein, the "pro" form, to be secreted from the expressing cell. The amino acid sequence Arg-Ser-Ile-Arg-Ser (amino acid residue nos. 288-292 in Sequence ID No. 24) is believed to constitute the cleavage site that produces the mature form of the protein, herein referred to as "mOP1-Ser" and described by amino acid residues 292-430 of Seq. ID No. 24. The amino acid sequence defining the conserved 6 cysteine skeleton of the mOP1 active region is defined by residues 334-430 of Seq. ID No. 24.

FIG. 23A and 23B compare compares the amino acid sequence homology of the mature hOP1 and mOP1 proteins (OP1-18Ser and mOP1-Ser). Amino acid identity is indicated by three dots (. . . ). As can be seen in this figure, the mature form of mOP1, mOP1-Ser, shares significant amino acid sequence homology with OP1-18Ser (98% identity), differing at only three positions in this region. Like OP1-18Ser, mOP1-Ser has a seven cysteine functional domain. In addition, the prepro form of the mOP1 protein shows substantially the same homology with that of OP1. The high degree of amino acid sequence homology shared by the mature proteins is not surprising as the amino acid sequences of the mature forms of other TGF-β-like proteins generally also have been found to be highly conserved across different animal species (e.g., compare Vgr and Vgl, two related genes isolated from mouse and Xenopus, respectively). The high degree of amino acid sequence homology exhibited between the mature forms of the two animal species of OP1 proteins suggests that the mOP1 protein will purify essentially as OP1 does, or with only minor modifications of the protocols disclosed for OP1. Similarly, purified mOP1-Ser is predicted to have an apparent molecular weight of about 36 kDa as a glycosylated oxidized homodimer, and about 18 kDa as a reduced single subunit, as determined by comparison with molecular weight standards on an SDS-polyacrylamide electrophoresis gel. There appear to be three potential N glycosylation sites in the mature protein. The unglycosylated homodimer (e.g., one expressed from E. coli) is predicted to have a molecular weight of about 27 kDa.

2. OP2

2.1 mOP2

The cDNA encoding the C-terminus of mOP2 protein first was identified following the procedure for retrieving mOP1 DNA. The 5' end of the gene was identified subsequently by screening a second mouse cDNA library (Mouse PCC4 cDNA (ZAP) library, Stratagene, Inc., La Jolla, Calif.).

Mouse OP2 (mOP2) protein shares significant amino acid sequence homology with the amino acid sequence of the OP1 active region, e.g., OPS or OP7, about 74% identity, and less homology with the intact mature form, e.g., OP1-18Ser, about 58% identity. The mOP2 protein differs from the OP1 protein by only one non-conservative amino acid change in the active region. The cDNA sequence, and the encoded amino acid sequence, for the full length mOP2 protein are depicted in Sequence ID No. 26. The full-length form of the protein is referred to as the prepro form of mOP2 ("mOP2-PP"), and includes a signal peptide sequence at its N-terminus. The amino acid sequence Leu-Ala-Leu-Cys-Ala-Leu (amino acid residues 13-18 of Sequence ID No. 26) is believed to constitute the cleavage site for the removal of the signal peptide sequence, leaving an intermediate form of the protein, the "pro" form, to be secreted from the expressing cell. The amino acid sequence Arg-Ala-Pro-Arg-Ala (amino acid residues 257-261 of Seq. ID No. 26) is believed to constitute the cleavage site that produces the mature form of the protein, herein referred to as "mOP2-Ala", and described by residues 261-399 of Seq. ID No. 26. The amino acid sequence defining the conserved 6 cysteine skeleton of the mOP2 active region is defined by residues 303-399 of Seq. ID No. 26.

2.2 hOP2

Using a probe prepared from the pro region of mOP2 (an EcoRl -BamHI digest fragment, bp 467-771 of Sequence ID No. 26), a human hippocampus library was screened (human hippocampus cDNA lambda ZAP II library, Stratagene, Inc., La Jolla, Calif.) following essentially the same procedure as for the mouse library screens. The procedure identified the N-terminus of a novel DNA encoding an amino acid sequence having substantial homology with the mOP2 protein. The C-terminus of the gene subsequently was identified by probing a human genomic library (in lambda phage EMBL-3, Clontech, Inc., Palo Alto, Calif.) with a labelled fragment from the novel human DNA in hand. The novel polypeptide chain encoded by this DNA is referred to herein as hOP2 protein, and the mature form of which shares almost complete amino acid sequence identity (about 92%) with mOP2-A (see FIG. 23C-23E are and infra).

The cDNA sequence, and the encoded amino acid sequence, for the prepro form of hOP2 ("hOP2-PP") is depicted in Seq. ID No. 28. This full-length form of the protein also includes a signal peptide sequence at its N-terminus. The amino acid sequence Leu-Ala-Leu-Cys-Ala-Leu (amino acid residues 13-18 of Seq. ID No. 28) is believed to constitute the cleavage site for the removal of the signal peptide sequence, leaving an intermediate form of the protein, the "pro" form, to be secreted from the expressing cell. The amino acid sequence Arg-Thr-Pro-Arg-Ala (amino acid residues 260-264 of Seq. ID No. 28) is believed to constitute the cleavage site that produces what is believed to be the mature form of the protein, herein referred to as "hOP2-Ala" and described by residues 264 to 402 of Seq. ID No. 28. The amino acid sequence defining the conserved 6 cysteine skeleton of the hOP2 active region is defined by residues 306-402 of Seq. ID No. 28.

Additional mature species of hOP2 thought to be active include truncated short sequences, "hOP2-Pro" (described by residues 267 to 402, Seq. ID No. 28) and "hOP2-Arg" (described by residues 270 to 402, Seq. ID No. 28), and a slightly longer sequence ("hOP2-Ser", described by residues 243 to 402, Seq. ID No. 28).

It should be noted that the nucleic acid sequence encoding the N-terminus of the prepro form of both mOP2 and hOP2 is rich in guanidine and cytosine base pairs. As will be appreciated by those skilled in the art, sequencing such a "G-C rich" region can be problematic, due to stutter and/or band compression. Accordingly, the possibility of sequencing errors in this region can not be ruled out. However, the definitive amino acid sequence for these and other, similarly identified proteins can be determined readily by expressing the protein from recombinant DNA using, for example, any of the means disclosed herein, and sequencing the polypeptide chain by conventional peptide sequencing methods well known in the art.

The genomic sequences of both the murine and human OP2 genes also have been cloned. Like the human OP1 gene, the protein coding region of the OP2 gene is contained on seven exons.

FIG. 23C-23E compare the amino acid sequences of the mature mOP2 and hOP2 proteins, mOP2-A and hOP2-Ala. Identity is indicated by three dots (. . . ) in the mOP2-A sequence. As is evident from the figure, the amino acid sequence homology between the mature forms of these two proteins is substantial (about 92% identity between the mature sequences, about 95% identity within the C-terminal active region).

FIG. 24A-24D compare the amino acid sequences for the mature forms of all four species of OP1 and OP2 proteins. Here again, identity is indicated by three dots (. . . ). Like the mOP2 protein, the hOP2 protein shares significant homology (about 74% identity) with the amino acid sequence defining the OP1 active region (OPS or OP7, residues 43-139 and 38-139, respectively), and less homology with OP1-18Ser (about 58% identity). Both OP2 proteins share the conserved seven cysteine skeleton seen in the OP1 proteins. In addition, the OP2 proteins comprise an eighth cysteine residue within this region (see position 78 in FIG. 24B.

The greatest homology between sequences (about 74% identity, indicated by dots) occurs within the C-terminal active region defined by OPS and OP7. The OP1 and OP2 proteins share less amino acid sequence homology with the active regions of the CBMP2A and CBMP2B proteins. The OP1 proteins share only about 60% sequence identity with the CBMP2 proteins in this region; the OP2 proteins share only about 58% identity with the CBMP2 protein in this region. The CBMP2 proteins are most easily distinguished from the OP1/OP2 proteins in the active region by at least 9 nonconservative amino acid changes, in addition to munerous conservative amino acid changes which may have smaller effects on activity.

A preferred generic amino acid sequence useful as a subunit of a dimeric osteogenic protein capable of inducing endochondral bone or cartilage formation when implanted in a mammal in association with a matrix, and which incorporates the maximum homology between the identified OP1 and OP2 proteins (see FIG. 24), can be described by the sequence referred to herein as "OPX", described below and in Seq. ID No. 30. OPX is a composite sequence designed from the four sequences presented in FIG. 24 (beginning at residue 38), and includes both the specific amino acid sequence created by the amino acid identity shared by the four OP1, OP2 species, as well as alternative residues for the variable positions within the sequence.

    Cys Xaa Xaa His Glu Leu Tyr Val Ser Phe       1               5                  10     Xaa Asp Leu Gly Trp Xaa Asp Trp Xaa Ile                      15                  20     Ala Pro Xaa Gly Tyr Xaa Ala Tyr Tyr Cys                      25                  30     Glu Gly Glu Cys Xaa Phe Pro Leu Xaa Ser                      35                  40     Xaa Met Asn Ala Thr Asn His Ala Ile Xaa                      45                  50     Gln Xaa Leu Val His Xaa Xaa Xaa Pro Xaa                      55                  60     Xaa Val Pro Lys Xaa Cys Cys Ala Pro Thr                      65                  70     Xaa Leu Xaa Ala Xaa Ser Val Leu Tyr Xaa                      75                  80     Asp Xaa Ser Xaa Asn Val Ile Leu Xaa Lys                      85                  90     Xaa Arg Asn Met Val Val Xaa Ala Cys Gly                      95                 100     Cys His,

and wherein Xaa at res. 2=(Lys or Arg); Xaa at res. 3=(Lys or Arg); Xaa at res. 11=(Arg or Gln); Xaa at res. 16=(Gln or Leu); Xaa at res. 19=(Ile or Val); Xaa at res. 23=(Glu or Gln); Xaa at res. 26=(Ala or Ser); Xaa at res. 35=(Ala or Ser); Xaa at res. 39=(Asn or Asp); Xaa at res. 41=(Tyr or Cys); Xaa at res. 50=(Val or Leu); Xaa at res. 52=(Ser or Thr); Xaa at res. 56=(Phe or Leu); Xaa at res. 57=(Ile or Met); Xaa at res. 58=(Asn or Lys); Xaa at res. 60=(Glu, Asp or Asn); Xaa at res. 61=(Thr, Ala or Val); Xaa at res. 65=(Pro or Ala); Xaa at res. 71=(Gln or Lys); Xaa at res. 73=(Asn or Ser); Xaa at res. 75=(Ile or Thr); Xaa at res. 80=(Phe or Tyr); Xaa at re. 82=(Asp or Ser); Xaa at res. 84=(Ser or Asn); Xaa at res. 89=(Lys or Arg); Xaa at res. 91=(Tyr or His); and Xaa at res. 97=(Arg or Lys).

The high degree of homology exhibited between the various OP1 and OP2 proteins suggests that the novel osteogenic proteins identified herein will purify essentially as OP1 does, or with only minor modifications of the protocols disclosed for OP1. Similarly, the purified mOP1, mOP2, and hOP2 proteins are predicted to have an apparent molecular weight of about 18 kDa as reduced single subunits, and an apparent molecular weight of about 36 kDa as oxidized dimers, as determined by comparison with molecular weight standards on an SDS-polyacrylamide electrophoresis gel. Unglycosylated dimers (e.g., proteins produced by recombinant expression in E. coli) are predicted to have an apparent molecular weight of about 27 kDa. There appears to be one potential N glycosylation site in the mature forms of the mOP2 and hOP2 proteins.

The identification of osteogenic proteins having an active region comprising eight cysteine residues also allows one to construct osteogenic polypeptide chains patterned after either of the following template amino acid sequences, or to identify additional osteogenic proteins having this sequence. The template sequences contemplated are "OPX-7C", comprising the conserved six cysteine skeleton plus the additional cysteine residue identified in the OP2 proteins, and "OPX-8C", comprising the conserved seven cysteine skeleton plus the additional cysteine residue identified in the OP2 proteins. The OPX-7C and OPX-8C sequences are described below and in Seq. ID Nos. 31 and 32, respectively. Each Xaa in these template sequences independently represents one of the 20 naturally-occurring L-isomer, α-amino acids, or a derivative thereof. Biosynthetic constructs patterned after this template readily are constructed using conventional DNA synthesis or peptide synthesis techniques well known in the art. Once constructed, osteogenic proteins comprising these polypeptide chains can be tested as disclosed herein.

    "OPX-7C" (Sequence ID No. 31):          Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa            1               5                  10          Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       15                  20          Xaa Xaa Cys Xaa Xaa Xaa Cys Xaa Xaa Xaa Xaa                   25                  30          Xaa Xaa Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa               35                  40          Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa           45                  50                  55          Xaa Xaa Xaa Xaa Xaa Cys Cys Xaa Xaa Xaa Xaa                           60                  65          Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                       70                  75          Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                   80                  85          Xaa Xaa Xaa Xaa Xaa Cys Xaa Cys Xaa               90                  95

"OPX-8C" (Sequence ID No. 32 comprising additional five residues at the N-terminus, including a conserved cysteine residue):

    Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa       1               5                  10     Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                  15                  20     Xaa Xaa Xaa Xaa Xaa Xaa Xaa Cys Xaa Xaa Xaa              25                  30     Cys Xaa Xaa Xaa Xaa Xaa Xaa Cys Xaa Xaa Xaa Xaa          35                  40                  45     Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                      50                  55     Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Cys                  60                  65     Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa                  70                  75     Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa              80                  85     Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Cys          90                  95     Xaa Cys Xaa     100

III. MATRIX PREPARATION

A. General Consideration of Matrix Properties

The currently preferred carrier material is a xenogenic bone-derived particulate matrix treated as disclosed herein. This carrier may be replaced by either a biodegradable-synthetic or synthetic-inorganic matrix (e.g., HAP, collagen, tricalcium phosphate or polylactic acid, polyglycolic acid, polybutyric acid and various copolymers thereof.)

Studies have shown that surface charge, particle size, the presence of mineral, and the methodology for combining matrix and osteogenic protein all play a role in achieving successful bone induction. Perturbation of the charge by chemical modification abolishes the inductive response. Particle size influences the quantitative response of new bone; particles between 70 μm and 420 μm elicit the maximum response. Contamination of the matrix with bone mineral will inhibit bone formation. Most importantly, the procedures used to formulate osteogenic protein onto the matrix are extremely sensitive to the physical and chemical state of both the osteogenic protein and the matrix.

The sequential cellular reactions in the interface of the bone matrix/osteogenic protein implants are complex. The multistep cascade includes: binding of fibrin and fibronectin to implanted matrix, migration and proliferation of mesenchymal cells, differentiation of the progenitor cells into chondroblasts, cartilage formation, cartilage calcification, vascular invasion, bone formation, remodeling, and bone marrow differentiation.

A successful carrier for osteogenic protein should perform several important functions. It should carry osteogenic protein and act as a slow release delivery system, accommodate each step of the cellular response during bone development, and protect the osteogenic protein from nonspecific proteolysis. In addition, selected materials must be biocompatible in vivo and preferably biodegradable; the carrier must act as a temporary scaffold until replaced completely by new bone. Polylactic acid (PLA), polyglycolic acid (PGA), and various combinations have different dissolution rates in vivo. In bones, the dissolution rates can vary according to whether the implant is placed in cortical or trabecular bone.

Matrix geometry, particle size, the presence of surface charge, and the degree of both intra-and inter-particle porosity are all important to successful matrix performance. It is preferred to shape the matrix to the desired form of the new bone and to have dimensions which span non-union defects. Rat studies show that the new bone is formed essentially having the dimensions of the device implanted.

The matrix may comprise a shape-retaining solid made of loosely adhered particulate material, e.g., with collagen. It may also comprise a molded, porous solid, or simply an aggregation of close-packed particles held in place by surrounding tissue. Masticated muscle or other tissue may also be used. Large allogenic bone implants can act as a carrier for the matrix if their marrow cavities are cleaned and packed with particles and the dispersed osteogenic protein.

The preferred matrix material, prepared from xenogenic bone and treated as disclosed herein, produces an implantable material useful in a variety of clinical settings. In addition to its use as a matrix for bone formation in various orthopedic, periodontal, and reconstructive procedures, the matrix also may be used as a sustained release carrier, or as a collagenous coating for implants. The matrix may be shaped as desired in anticipation of surgery or shaped by the physician or technician during surgery. Thus, the material may be used for topical, subcutaneous, intraperitoneal, or intramuscular implants; it may be shaped to span a nonunion fracture or to fill a bone defect. In bone formation procedures, the material is slowly absorbed by the body and is replaced by bone in the shape of or very nearly the shape of the implant.

Various growth factors, hormones, enzymes, therapeutic compositions, antibiotics, and other bioactive agents also may be adsorbed onto the carrier material and will be released over time when implanted as the matrix material is slowly absorbed. Thus, various known growth factors such as EGF, PDGF, IGF, FGF, TGF-α, and TGF-β may be released in vivo. The material can be used to release chemotherapeutic agents, insulin, enzymes, or enzyme inhibitors.

B. Bone-Derived Matrices

1. Preparation of Demineralized Bone

Demineralized bone matrix, preferably bovine bone matrix, is prepared by previously published procedures (Sampath and Reddi (1983) Proc. Natl. Acad. Sci. USA 80:6591-6595). Bovine diaphyseal bones (age 1-10 days) are obtained from a local slaughterhouse and used fresh. The bones are stripped of muscle and fat, cleaned of periosteum, demarrowed by pressure with cold water, dipped in cold absolute ethanol, and stored at -20° C. They are then dried and fragmented by crushing and pulverized in a large mill. Care is taken to prevent heating by using liquid nitrogen. The pulverized bone is milled to a particle size in the range of 70-850 μm, preferably 150-420 μm, and is defatted by two washes of approximately two hours duration with three volumes of chloroform and methanol (3:1). The particulate bone is then washed with one volume of absolute ethanol and dried over one volume of anhydrous ether yielding defatted bone powder. The defatted bone powder is then demineralized by four successive treatments with 10 volumes of 0.5N HCl at 4° C. for 40 min. Finally, neutralizing washes are done on the demineralized bone powder with a large volume of water.

2. Guanidine Extraction

Demineralized bone matrix thus prepared is extracted with 5 volumes of 4M guanidine-HCl, 50 mM Tris-HCl, pH 7.0 for 16 hr. at 4° C. The suspension is filtered. The insoluble material is collected and used to fabricate the matrix. The material is mostly collagenous in nature. It is devoid of osteogenic or chondrogenic activity.

3. Matrix Treatments

The major component of all bone matrices is Type-I collagen. In addition to collagen, demineralized bone extracted as disclosed above includes non-collagenous proteins which may account for 5% of its mass. In a xenogenic matrix, these noncollagenous components may present themselves as potent antigens, and may constitute immunogenic and/or inhibitory components. These components also may inhibit osteogenesis in allogenic implants by interfering with the developmental cascade of bone differentiation. It has been discovered that treatment of the matrix particles with a collagen fibril-modifying agent extracts potentially unwanted components from the matrix, and alters the surface structure of the matrix material. Useful agents include acids, organic solvents or heated aqueous media. Various treatments are described below. A detailed physical analysis of the effect these fibril-modifying agents have on demineralized, quanidine-extracted bone collagen particles is disclosed in copending U.S. patent application Ser. No. 483,913, filed Feb. 22, 1990.

After contact with the fibril-modifying agent, the treated matrix is washed to remove any extracted components, following a form of the procedure set forth below:

1. Suspend in TBS (Tris-buffered saline) 1 g/200 ml and stir at 4° C. for 2 hrs; or in 6M urea, 50 mM Tris-HCl, 500 mM NaCl, pH 7.0 (UTBS) or water and stir at room temperature (RT) for 30 minutes (sufficient time to neutralize the pH);

2. Centrifuge and repeat wash step; and

3. Centrifuge; discard supernatant; water wash residue; and then lyophilize.

3.1 Acid Treatments

1. Trifluoroacetic acid.

Trifluoroacetic acid is a strong non-oxidizing acid that is a known swelling agent for proteins, and which modifies collagen fibrils.

Bovine bone residue prepared as described above is sieved, and particles of the appropriate size are collected. These particles are extracted with various percentages (1.0% to 100%) of trifluoroacetic acid and water (v/v) at 0° C. or room temperature for 1-2 hours with constant stirring. The treated matrix is filtered, lyophilized, or washed with water/salt and then lyophilized.

2. Hydrogen Fluoride.

Like trifluoroacetic acid, hydrogen fluoride is a strong acid and swelling agent, and also is capable of altering intraparticle surface structure. Hydrogen fluoride is also a known deglycosylating agent. As such, HF may function to increase the osteogenic activity of these matrices by removing the antigenic carbohydrate content of any glycoproteins still associated with the matrix after guanidine extraction.

Bovine bone residue prepared as described above is sieved, and particles of the appropriate size are collected. The sample is dried in vacuo over P₂ O₅, transferred to the reaction vessel and exposed to anhydrous hydrogen fluoride (10-20 ml/g of matrix) by distillation onto the sample at -70° C. The vessel is allowed to warm to 0° C. and the reaction mixture is stirred at this temperature for 120 minutes. After evaporation of the hydrogen fluoride in vacuo, the residue is dried thoroughly in vacuo over KOH pellets to remove any remaining traces of acid. Extent of deglycosylation can be determined from carbohydrate analysis of matrix samples taken before and after treatment with hydrogen fluoride, after washing the samples appropriately to remove non-covalently bound carbohydrates. SDS-extracted protein from HF-treated material is negative for carbohydrate as determined by Con A blotting.

The deglycosylated bone matrix is next washed twice in TBS (Tris-buffered saline) or UTBS, water-washed, and then lyophilized.

Other acid treatments are envisioned in addition to HF and TFA. TFA is a currently preferred acidifying reagent in these treatments because of its volatility. However, it is understood that other, potentially less caustic acids may be used, such as acetic or formic acid.

3.2 Solvent Treatment

1. Dichloromethane.

Dichloromethane (DCM) is an organic solvent capable of denaturing proteins without affecting their primary structure. This swelling agent is a common reagent in automated peptide synthesis, and is used in washing steps to remove components.

Bovine bone residue, prepared as described above, is sieved, and particles of the appropriate size are incubated in 100% DCM or, preferably, 99.9% DCM/0.1% TFA. The matrix is incubated with the swelling agent for one or two hours at 0° C. or at room temperature. Alternatively, the matrix is treated with the agent at least three times with short washes (20 minutes each) with no incubation.

2. Acetonitrile.

Acetonitrile (ACN) is an organic solvent, capable of denaturing proteins without affecting their primary structure. It is a common reagent used in high-performance liquid chromatography, and is used to elute proteins from silica-based columns by perturbing hydrophobic interactions.

Bovine bone residue particles of the appropriate size, prepared as described above, are treated with 100% ACN (1.0 g/30 ml) or, preferably, 99.9% ACN/0.1% TFA at room temperature for 1-2 hours with constant stirring. The treated matrix is then water-washed, or washed with urea buffer, or 4M NaCl and lyophilized. Alternatively, the ACN or ACN/TFA treated matrix may be lyophilized without wash.

3. Isopropanol.

Isopropanol is also an organic solvent capable of denaturing proteins without affecting their primary structure. It is a common reagent used to elute proteins from silica HPLC columns.

Bovine bone residue particles of the appropriate size prepared as described above are treated with 100% isopropanol (1.0 g/30 ml) or, preferably, in the presence of 0.1% TFA, at room temperature for 1-2 hours with constant stirring. The matrix is then water-washed or washed with urea buffer or 4M NaCl before being lyophilized.

4. Chloroform

Chloroform also may be used to increase surface area of bone matrix like the reagents set forth above, either alone or acidified.

Treatment as set forth above is effective to assure that the material is free of pathogens prior to implantation.

3.3 Heat Treatment

The currently most preferred agent is a heated aqueous fibril-modifying medium such as water, to increase the matrix particle surface area and porosity. The currently most preferred aqueous medium is an acidic aqueous medium having a pH of less than about 4.5, e.g., within the range of about pH 2-pH 4 which may help to "swell" the collagen before heating. 0.1% acetic acid, which has a pH of about 3, currently is most preferred. 0.1M acetic acid also may be used.

Various amounts of delipidated, demineralized guanidine-extracted bone collagen are heated in the aqueous medium (1 g matrix/30 ml aqueous medium) under constant stirring in a water jacketed glass flask, and maintained at a given temperature for a predetermined period of time. Preferred treatment times are about one hour, although exposure times of between about 0.5 to two hours appear acceptable. The temperature employed is held constant at a temperature within the range of about 37° C. to 65° C. The currently preferred heat treatment temperature is within the range of about 45° C. to 60° C.

After the heat treatment, the matrix is filtered, washed, lyophilized and used for implant. Where an acidic aqueous medium is used, the matrix also is preferably neutralized prior to washing and lyophilization. A currently preferred neutralization buffer is a 200 mM sodium phosphate buffer, pH 7.0. To neutralize the matrix, the matrix preferably first is allowed to cool following thermal treatment, the acidic aqueous medium (e.g., 0.1% acetic acid) then is removed and replaced with the neutralization buffer and the matrix agitated for about 30 minutes. The neutralization buffer then may be removed and the matrix washed and lyophilized (see infra).

The effects of heat treatment on morphology of the matrix material is apparent from a comparison of the photomicrographs in FIG. 25 with those of FIG. 26. FIG. 25 illustrates the morphology of the successfully altered collagen surface treated with water heated to (25A) 37° C., (25B) 45° C., (25C) 55° C. and (25D) 65° C. The photomicrographs of FIG. 26 describe the morphology of untreated rat and bovine bone matrix (26A and 26B, respectively). As is evident from the micrographs, the hot aqueous treatment can increase the degree of micropitting on the particle surface (e.g., about 10-fold,) as well as also substantially increasing the particle's porosity (compare FIG. 26B and 25C, 25D). This alteration of the matrix particle's morphology substantially increases the particle surface area. Careful measurement of the pore and micropit sizes reveals that hot aqueous medium treatment of the matrix particles yields particle pore and micropit diameters within the range of 1 μm to 100 μm.

Characterization of the extract produced by the hot aqueous treatment reveals that the treatment also may be removing component(s) whose association with the matrix may interfere with new bone formation in vivo. FIG. 27 is a 214 nm absorbance tracing of the extract isolated from hot water treated bovine matrix, and indicates the effect of each peak (or fraction) on in vivo bone formation.

The extract from a large scale preparative run (100 g bovine matrix, hot water-treated) was collected, acidified with 0.1% TFA, and run on a C-18 HPLC column, using a Millipore Delta Prep Cartridge. Fractions were collected at 50 mL intervals at a flow rate of 25 ml/min. and pooled appropriately to isolate the individual peaks in the tracing. Each of these fractions then was implanted with recombinant OP1 and an appropriate rat matrix carrier (see infra), and its effect on bone formation activity measured. Fraction 12 alone appears to inhibit bone formation in allogenic implants. The inhibitory activity appears to be dose dependent. It is possible that the removal of the inhibitory component(s) present in this peak may be necessary to support osteogenic activity in xenogenic implants.

FIG. 28 describes the influence of complete solvent extract from hot water-treated matrix on osteogenic activity as measured in 12-day implants by alkaline phosphatase activity (28A) and calcium content (28B). Rat carrier matrix and OP1 implanted without any extract is used as a positive control. The solvent extract obtained from 100 grams of hot water-treated bovine matrix was evaporated and taken up in 6M of 50% acetonitrile/0.1% TFA. 100-300 μl aliquots then were combined with known amounts of recombinant OP1, and 25 mg of rat matrix carrier, and assayed (see infra). The results clearly show the extract inhibits new bone formation in a dose dependent manner.

The matrix also may be treated to remove contaminating heavy metals, such as by exposing the matrix to a metal ion chelator. For example, following thermal treatment with 0.1% acetic acid, the matrix may be neutralized in a neutralization buffer containing EDTA (sodium ethylenediaminetetraacetic acid), e.g., 200 mM sodium phosphate, 5 mM EDTA, pH 7.0. 5 mM EDTA provides about a 100-fold molar excess of chelator to residual heavy metals present in the most contaminated matrix tested to date. Subsequent washing of the matrix following neutralization appears to remove the bulk of the EDTA. EDTA treatment of matrix particles reduces the residual heavy metal content of all metals tested (Sb, As, Be, Cd, Cr, Cu, Co, Pb, Hg, Ni, Se, Ag, Zn, Tl) to less than about 1 ppm. Bioassays with EDTA-treated matrices indicate that treatment with the metal ion chelator does not inhibit bone inducing activity.

The collagen matrix materials preferably take the form of a fine powder, insoluble in water, comprising nonadherent particles. It may be used simply by packing into the volume where new bone growth or sustained release is desired, held in place by surrounding tissue. Alternatively, the powder may be encapsulated in, e.g., a gelatin or polylactic acid coating, which is absorbed readily by the body. The powder may be shaped to a volume of given dimensions and held in that shape by interadhering the particles using, for example, soluble, species-biocompatible collagen. The material may also be produced in sheet, rod, bead, or other macroscopic shapes.

Demineralized rat bone matrix used as an allogenic matrix in certain of the experiments disclosed herein, is prepared from several of the dehydrated diaphyseal shafts of rat femur and tibia as described herein to produce a bone particle size which passes through a 420 μm sieve. The bone particles are subjected to dissociative extraction with 4M guanidine-HCl. Such treatment results in a complete loss of the inherent ability of the bone matrix to induce endochondral bone differentiation. The remaining insoluble material is used to fabricate the matrix. The material is mostly collagenous in nature, and upon implantation, does not induce cartilage and bone formation. All new preparations are tested for mineral content and osteogenic activity before use. The total loss of biological activity of bone matrix is restored when an active osteoinductive protein fraction or a substantially pure osteoinductive protein preparation is reconstituted with the biologically inactive insoluble collagenous matrix.

C. SYNTHETIC TISSUE-SPECIFIC MATRICES

In addition to the naturally-derived bone matrices described above, useful matrices also may be formulated synthetically if appropriately modified. One example of such a synthetic matrix is the porous, biocompatible, in vivo biodegradable synthetic matrix disclosed in copending U.S. Ser. No. 529,852, filed May 30, 1990, the disclosure of which is hereby incorporated by reference. Briefly, the matrix comprises a porous crosslinked structural polymer of biocompatible, biodegradable collagen, most preferably tissue-specific collagen, and appropriate, tissue-specific glycosaminoglycans as tissue-specific cell attachment factors. Bone tissue-specific collagen (e.g., Type I collagen) derived from a number of sources may be suitable for use in these synthetic matrices, including soluble collagen, acid-soluble collagen, collagen soluble in neutral or basic aqueous solutions, as well as those collagens which are commercially available. In addition, Type II collagen, as found in cartilage, also may be used in combination with Type I collagen.

Glycosaminoglycans (GAGs) or mucopolysaccharides are polysaccharides made up of residues of hexoamines glycosidically bound and alternating in a more-or-less regular manner with either hexouronic acid or hexose moieties. GAGs are of animal origin and have a tissue specific distribution (see, e.g., Dodgson et al. in Carbohydrate Metabolism and its Disorders (Dickens et al., eds.) Vol. 1, Academic Press (1968)). Reaction with the GAGs also provides collagen with another valuable property, i.e., inability to provoke an immune reaction (foreign body reaction) from an animal host.

Useful GAGs include those containing sulfate groups, such as hyaluronic acid, heparin, heparin sulfate, chondroitin 6-sulfate, chondroitin 4-sulfate, dermatan sulfate, and keratin sulfate. For osteogenic devices chondroitin 6-sulfate currently is preferred. Other GAGs also may be suitable for forming the matrix described herein, and those skilled in the art will either know or be able to ascertain other suitable GAGs using no more than routine experimentation. For a more detailed description of mucopolysaccharides, see Aspinall, Polysaccharides, Pergamon Press, Oxford (1970).

Collagen can be reacted with a GAG in aqueous acidic solutions, preferably in diluted acetic acid solutions. By adding the GAG dropwise into the aqueous collagen dispersion, coprecipitates of tangled collagen fibrils coated with GAG results. This tangled mass of fibers then can be homogenized to form a homogeneous dispersion of fine fibers and then filtered and dried.

Insolubility of the collagen-GAG products can be raised to the desired degree by covalently cross-linking these materials, which also serves to raise the resistance to resorption of these materials. In general, any covalent cross-linking method suitable for cross-linking collagen also is suitable for cross-linking these composite materials, although cross-linking by a dehydrothermal process is preferred.

When dry, the cross-linked particles are essentially spherical with diameters of about 500 μm. Scanning electron microscopy shows pores of about 20 μm on the surface and 40 μm on the interior. The interior is made up of both fibrous and sheet-like structures, providing surfaces for cell attachment. The voids interconnect, providing access to the cells throughout the interior of the particle. The material appears to be roughly 99.5% void volume, making the material very efficient in terms of the potential cell mass that can be grown per gram of microcarrier.

Another useful synthetic matrix is one formulated from biocompatible, in vivo biodegradable synthetic polymers, such as those composed of glycolic acid, lactic acid and/or butyric acid, including copolymers and derivatives thereof. These polymers are well described in the art and are available commercially. For example, polymers composed of polyactic acid (e.g., MW 100 kDa), 80% polylactide/20% glycoside or poly 3-hydroxybutyric acid (e.g., MW 30 kDa) all may be purchased from PolySciences, Inc. The polymer compositions generally are obtained in particulate form and the osteogenic devices preferably fabricated under nonaqueous conditions (e.g., in an ethanol-trifluoroacetic acid solution, EtOH/TFA) to avoid hydrolysis of the polymers. In addition, one can alter the morphology of the particulate polymer compositions, for example to increase porosity, using any of a number of particular solvent treatments known in the art.

Osteogenic devices fabricated with osteogenic protein solubilized in EtOH/TFA and a matrix composed of polylactic acid, poly 3-hydroxybutyric acid, or 80% polylactide/20% glycoside are all osteogenically active when implanted in the rat model and bioassayed as described herein (e.g., as determined by calcium content, alkaline phosphatase levels and histology of 12-day implants, see Section V, infra).

IV. FABRICATION OF OSTEOGENIC DEVICE

The naturally sourced and recombinant proteins as set forth above, as well as other constructs, can be combined and dispersed in a suitable matrix preparation using any of the methods described below. In general, 50-100 ng of active protein is combined with the inactive carrier matrix (e.g., 25 mg matrix for rat bioassays). Greater amounts may be used for large implants.

1. Ethanol Triflouracetic Acid Lyophilization

In this procedure, osteogenic protein is solubilized in an ethanol triflouracetic acid solution (47.5% EtOH/0.01% TFA) and added to the carrier material. Samples are vortexed vigorously and then lyophilized. This method currently is preferred.

2. Acetonitrile Trifluoroacetic Acid Lyophilization

This is a variation of the above procedure, using an acetonitrile trifluroacetic acid (ACN/TFA) solution to solubilize the osteogenic protein that then is added to the carrier material. Samples are vigorously vortexed many times and then lyophilized.

3. Ethanol Precipitation

Matrix is added to osteogenic protein dissolved in guanidine-HCl. Samples are vortexed and incubated at a low temperature (e.g., 4° C.). Samples are then further vortexed. Cold absolute ethanol (5 volumes) is added to the mixture which is then stirred and incubated, preferably for 30 minutes at -20° C. After centrifugation (microfuge, high speed) the supernatant is discarded. The reconstituted matrix is washed twice with cold concentrated ethanol in water (85% EtOH) and then lyophilized.

4. Urea Lyophilization

For those osteogenic proteins that are prepared in urea buffer, the protein is mixed with the matrix material, vortexed many times, and then lyophilized. The lyophilized material may be used "as is" for implants.

5. Buffered Saline Lyophilization

Osteogenic protein preparations in physiological saline may also be vortexed with the matrix and lyophilized to produce osteogenically active material.

These procedures also can be used to adsorb other active therapeutic drugs, hormones, and various bioactive species to the matrix for sustained release purposes.

V. BIOASSAY

The functioning of the various proteins and devices of this invention can be evaluated with an in vivo bioassay. Studies in rats show the osteogenic effect in an appropriate matrix to be dependent on the dose of osteogenic protein dispersed in the matrix. No activity is observed if the matrix is implanted alone. In vivo bioassays performed in the rat model also have shown that demineralized, guanidine-extracted xenogenic bone matrix materials of the type described in the literature generally are ineffective as a carrier, can fail to induce bone, and can produce an inflammatory and immunological response when implanted unless treated as disclosed above. In certain species (e.g., monkey) allogenic matrix materials also apparently are ineffective as carriers (Aspenberg, et al. (1988) J. Bone Joint Surgery 70: 625-627.) The following sets forth various procedures for preparing osteogenic devices from the proteins and matrix materials prepared as set forth above, and for evaluating their osteogenic utility.

A. Rat Model

1. Implantation

The bioassay for bone induction as described by Sampath and Reddi ((1983) Proc. Natl. Acad. Sci. USA 80 6591-6595), herein incorporated by reference, may be used to monitor endochondral bone differentiation activity. This assay consists of implanting test samples in subcutaneous sites in recipient rats under ether anesthesia. Male Long-Evans rats, aged 28-32 days, were used. A vertical incision (1 cm) is made under sterile conditions in the skin over the thoracic region, and a pocket is prepared by blunt dissection. Approximately 25 mg of the test sample is implanted deep into the pocket and the incision is closed with a metallic skin clip. The day of implantation is designated as day one of the experiment. Implants were removed on day 12. The heterotropic site allows for the study of bone induction without the possible ambiguities resulting from the use of orthotropic sites. As disclosed herein, both allogenic (rat bone matrix) and xenogenic (bovine bone matrix) implants were assayed for bone forming activity. Allogenic implants were used in experiments performed to determine the specific activity of bone purified and recombinant osteogenic protein.

Bone inducing activity is determined biochemically by the specific activity of alkaline phosphatase and calcium content of the day 12 implant. An increase in the specific activity of alkaline phosphatase indicates the onset of bone formation. Calcium content, on the other hand, is proportional to the amount of bone formed in the implant. Bone formation therefore is calculated by determining the calcium content of the implant on day 12 in rats and is expressed as "bone forming units," where one bone forming unit represents the amount of protein that is needed for half maximal bone forming activity of the implant on day 12. Bone induction exhibited by intact demineralized rat bone matrix is considered to be the maximal bone differentiation activity for comparison purposes in this assay.

2. Cellular Events

Successful implants exhibit a controlled progression through the stages of protein-induced endochondral bone development, including: (1) transient infiltration by polymorphonuclear leukocytes on day one; (2) mesenchymal cell migration and proliferation on days two and three; (3) chondrocyte appearance on days five and six; (4) cartilage matrix formation on day seven; (5) cartilage calcification on day eight; (6) vascular invasion, appearance of osteoblasts, and formation of new bone on days nine and ten; (7) appearance of osteoclasts, bone remodeling and dissolution of the implanted matrix on days twelve to eighteen; and (8) hematopoietic bone marrow differentiation in the ossicles on day twenty-one. The results show that the shape of the new bone conforms to the shape of the implanted matrix.

3. Histological Evaluation

Histological sectioning and staining is preferred to determine the extent of osteogenesis in the implants. Implants are fixed in Bouins Solution, embedded in paraffin, and cut into 6-8 μm sections. Staining with toluidine blue or hemotoxylin/eosin demonstrates clearly the ultimate development of endochondral bone. Twelve day implants are usually sufficient to determine whether the implants contain newly induced bone.

4. Biological Markers

Alkaline phosphatase activity may be used as a marker for osteogenesis. The enzyme activity may be determined spectrophotometrically after homogenization of the implant. The activity peaks at 9-10 days in vivo and thereafter slowly declines. Implants showing no bone development by histology have little or no alkaline phosphatase activity under these assay conditions. The assay is useful for quantification and obtaining an estimate of bone formation quickly after the implants are removed from the rat. Alternatively, the amount of bone formation can be determined by measuring the calcium content of the implant.

5. Results

Histological examination of implants indicate that osteogenic devices containing the natural-sourced osteogenic protein or recombinant osteogenic protein have true osteogenic activity. Moreover, the osteogenic specific activity of recombinant OP1 homodimers matches that of the substantially pure natural-sourced material.

5.1 Bone Purified Osteogenic Protein

Implants containing osteogenic protein at several levels of purity have been tested to determine the most effective dose/purity level, in order to seek a formulation which could be produced on an industrial scale. As described supra, the results were measured by alkaline phosphatase activity level, calcium content, and histological examination and represented as bone forming units. Also as described supra, one bone forming unit represents the amount of protein that is needed for half maximal bone forming activity of the implant on day 12. The bone forming activity elicited by intact rat demineralized bone matrix is considered to be the maximal bone differentiation activity for comparison purposes in this assay.

Dose curves were constructed for bone inducing activity in vivo by assaying various concentrations of protein purified from bone at each step of the purification scheme. FIG. 11 shows representative dose curves in rats. Approximately 10-12 μg of the TSK-fraction (FIG. 11C), 3-4 μg of heparin-Sepharose-II fraction (FIG. 11B) , 0.5-1 μg of the C-18 column fraction (FIG. 11A), and 25-50 ng of gel eluted highly purified 30 kDa protein is needed for unequivocal bone formation (half maximum activity) when implanted with 25 mg of matrix. Subsequent additional experiments have measured a half maximum activity of about 21-25 ng protein per 25 mg matrix for the highly purified, gel eluted 30 kDa osteogenic protein (see U.S. Pat. No. 5,011,691.) Thus, 0.8-1.0 ng of highly purified osteogenic protein per mg of implant matrix is sufficient to exhibit half maximal bone differentiation in vivo. 50 to 100 ng per 25 mg of implant normally is sufficient to produce maximum endochondral bone. Thus, 2 to 4 ng osteogenic protein per mg of implant matrix is a reasonable dosage, although higher dosages may be used.

As shown in FIG. 17, osteogenic devices comprising unglycosylated osteogenic protein are osteogenically active. Compare FIGS. 17B (showing carrier and glycosylated protein) and 17C (showing carrier and deglycosylated protein). Arrows indicate osteoblasts. FIG. 17A is a control where carrier alone was implanted. No bone formation is evident in this control implant.

5.2 Recombinant Osteogenic Protein

Homodimers of the various fusion constructs disclosed herein and expressed in E. coli all are osteogenically active. In addition, osteogenic activity is present with OP1A-CBMP2B1, OP1B-CBMP2B1, and OP1C-CBMP2B2 protein combinations. In addition, dimeric species of the truncated analog active regions (COP5 and COP7, disclosed in U.S. Pat. No. 5,011,691), alone or in combination, also induce osteogenesis as determined by histological examination.

Recombinant OP1 expressed from different mammalian cell sources and purified to different extents (1-5% pure to 30-90% pure) were tested for osteogenic activity in vivo as set forth above using 25 mg matrix. Table 9 below shows the histology score for OP1 expressed in all three cell types.

                  TABLE 9     ______________________________________                            OP1 Protein                            Concentration*                                        Histology     Mammalian Cells                OP1 Subunit (ng/implant)                                        Score (%)     ______________________________________     BSC40-tsA58                18 kDa      32.5        50                (70-90% pure)                            65.0        40                            130.0       80                            260.0       100                16 kDa      12.5        20                (30-40% pure)                            25.0        50                            50.0        80                            100.0       100                            200.0       100     CHO        16-20 kDa   50.0        90                (less than  100.0       90                5% pure)    200.0       100     COS        18 kDa      25.0        10                (less than  50.0        30                5% pure)    100.0       90                            200.0       90     demineralized rat matrix   40     ______________________________________      10-30%: moderate bone formation.      30-80%: extensive bone formation.      above 80%: evidence of hematopoietic bone marrow recruitment.      *estimated by immunoblots or gel scanning.

The histology scores detailed in Table 9 show that OP1 is active regardless of cell source, and that the activity mimics that of natural-sourced bovine osteogenic protein (see discussion of FIG. 31 and 32, infra.) Moreover, the bone-inducing activity is highly reproducible and dose dependent.

Additional bioassays, performed using highly purified OP1 (90% pure), and formulated with rat matrix by the acetonitrile/TFA method, suggest that CHO-produced OP1 shows slightly more bone-inducing activity when compared to BSC-derived OP1 preparations (at lower protein concentrations). Finally, numerous bioassays have been conducted with the various degraded species identified in the different OP1 preparations (e.g., OP1-16Ala, OP1-16Val, OP1-16Ser, OP1-16Leu and OP1-16Met.) Significant variations in bone inducing activity, as measured by calcium content or histology, could not be detected among these different OP1species.

Further evidence of the bone-forming activity of recombinant OP1 is provided in the photomicrographs of FIGS. 29 and 30. FIGS. 29A-F are photomicrographs recording the histology of allogenic implants using recombinant OP1 expressed from COS, BSC, and COS cells. The micrographs (magnified 220×), provide graphic evidence of the full developmental cascade induced by the osteogenic proteins of this invention, confirming that recombinantly produced OP1 alone is sufficient to induce endochondral bone formation, when implanted in association with a matrix. As evidenced in FIG. 29A, allogenic implants that do not contain OP1 show no new bone formation at 12 days post implant. Only the implanted bone matrix (m) and surrounding mesenchyme are seen. Conversely, implants containing OP1 already show evidence of extensive chondrogenesis by 7 days post implant (FIG. 29B, 500 ng BSC-produced protein, 30% pure). Here, newly formed cartilage cells, chondroblasts (Cb) and chondrocytes (Cy) are in close contact with the matrix (m). By 9 days post implant endochondral bone differentiation, cartilage calcification, hypertrophy of chondrocytes, vascular invasion, and the onset of new bone formation are all evident (FIG. 29C, 220 ng COS-produced protein, approx. 5% pure). Invading capillaries (c) and the appearance of basophilic osteoblasts (indicated by arrows) near the vascular endothelium are particularly evident. By 12 days post implant extensive bone formation and remodeling has occurred (FIG. 29D (220×), and 29E (400×), CHO-produced protein, approx. 60% pure). The newly formed bone laid down by osteoblasts is being remodeled by multinucleated osteoclasts (Oc), and the implanted matrix is being reabsorbed and replaced by remodeled bone. Bone marrow recruitment in the newly formed ossicles is also evident. Finally, hematopoietic bone marrow differentiation within the ossicles can be seen by 22 days post implant (FIG. 29F, 500 ng BSC-produced protein, 30% pure). By this time most of the implanted matrix (m) has been resorbed and is occupied by newly-formed bone containing ossicles filled with bone marrow elements including erythrocytic and granulocytic series and megakaryocytes. Similar histological observations have been made for implants incorporating greater than 90% pure OP1 preparations.

FIG. 30 is a photomicrograph showing the histology at 12 days post implant for a xenogenic implant using hot water-treated bovine matrix and OP1 (BSC-produced). The recruitment of hematopoietic bone marrow elements is evident in the photomicrograph, showing that the bone forming activity of xenogenic implants with OP1 parallels that of allogenic implants (compare FIG. 30 with FIGS. 29D and 29E).

The cellular events exhibited by the OP1 matrix implants and evidenced in FIGS. 29 and 30 truly mimic the endochondral bone differentiation that occurs during the foetal development. Although endochondral bone differentiation has been the predominant route, there is also evidence for intra-membraneous bone formation at the outer surface of the implant.

FIGS. 31 and 32 describe the dose dependence of osteogenic activity for 12-day implants comprising recombinant OP1 expressed from different mammalian cell sources, as determined by specific activity of alkaline phosphatase and calcium content of allogenic implants (FIG. 31) and xenogenic implants of this invention (FIGS. 32A and 32B, respetively). In all cases, OP1 protein concentration (quantitated by immuno blot staining or by gel scanning), is represented in nanograms. In each case, bone inducing activity is specific to OP1 in a dose dependent manner in all cells. Moreover, osteogenic activity of the mammalian cell-produced protein mimics that of the natural-sourced material. Highly purified gel-eluted osteogenic bovine protein, purified as disclosed herein and in U.S. Pat. Nos. 4,968,590 and 5,011,691, has a half maximal activity of at least about 0.8-1 ng/mg matrix (20-25 ng protein/25 mg matrix). As can be seen in Table 9 and FIGS. 31 and 32, even partially purified recombinantly produced OP1 falls within this range of osteogenic activity (about 20-30 ng/25 mg matrix).

B. Feline Model

The purpose of this study is to establish a large animal efficacy model for the testing of the osteogenic devices of the invention, and to characterize repair of massive bone defects and simulated fracture non-union encountered frequently in the practice of orthopedic surgery. The study is designed to evaluate whether implants of osteogenic protein with a carrier can enhance the regeneration of bone following injury and major reconstructive surgery by use of this large mammal model. The first step in this study design consists of the surgical preparation of a femoral osteotomy defect which, without further intervention, would consistently progress to non-union of the simulated fracture defect. The effects of implants of osteogenic devices into the created bone defects are evaluated by the study protocol described below. While this and the rabbit study, described infra, use allogenic matrices as carrier material, appropriate treatment as described herein of any bone-derived matrix material is anticipated to render the matrix suitable for xenogenic implants. Similarly, while the osteogenic protein used in this and the rabbit study is bOP, it is anticipated that any of the osteogenic proteins disclosed herein may be substituted.

1. Procedure

Sixteen adult cats each weighing less than 10 lbs. undergo unilateral preparation of a 1 cm bone defect in the right femur through a lateral surgical approach. In other experiments, a 2 cm bone defect was created. The femur is immediately internally fixed by lateral placement of an 8-hole plate to preserve the exact dimensions of the defect. There are three different types of materials implanted in the surgically created cat femoral defects: group I (n=3) is a control group which undergoes the same plate fixation with implants of 4M guanidine-HCl-treated (inactivated) cat demineralized bone matrix powder (GuHCl-DBM) (360 mg); group II (n=3) is a positive control group implanted with biologically active demineralized bone matrix powder (DBM) (360 mg); and group III (n=10) undergoes a procedure identical to groups I-II, with the addition of osteogenic protein onto each of the GuHCl-DBM carrier samples. To summarize, the group III osteogenic protein-treated animals are implanted with exactly the same material as the group I animals, but with the singular addition of osteogenic protein.

All animals are allowed to ambulate ad libitum within their cages post-operatively. All cats are injected with tetracycline (25 mg/kg subcutaneously (SQ) each week for four weeks) for bone labelling. All but four group III animals are sacrificed four months after femoral osteotomy.

2. Radiomorphometrics

In vivo radiomorphometic studies are carried out immediately post-op at 4, 8, 12 and 16 weeks by taking a standardized x-ray of the lightly anesthesized animal positioned in a cushioned X-ray jig designed to consistently produce a true anterio-posterior view of the femur and the osteotomy site. All X-rays are taken in exactly the same fashion and in exactly the same position on each animal. Bone repair is calculated as a function of mineralization by means of random point analysis. A final specimen radiographic study of the excised bone is taken in two planes after sacrifice. X-ray results are shown in FIG. 12, and displaced as percent of bone defect repair. To summarize, at 16 weeks, 60% of the group III femurs are united with average 86% bone defect regeneration (FIG.12, sec. A). By contrast, the group I GuHCl-DMB negative-control implants exhibit no bone growth at four weeks, less than 10% at eight and 12 weeks, and 16% (±10%) at 16 weeks with one of the five exhibiting a small amount of bridging bone (FIG. 12, sec. B). The group II DMB positive-control implants exhibited 18% (±3%) repair at four weeks, 35% at eight weeks, 50% (±10%) at 12 weeks and 70% (±12%) by 16 weeks, a statistical difference of p<0.01 compared to osteogenic protein at every month. One of the three (33%) is united at 16 weeks (FIG. 12, sec. C.)

3. Biomechanics

Excised test and normal femurs are immediately studied by bone densitometry, or wrapped in two layers of saline-soaked towels, placed into sealed plastic bags, and stored at -20° C. until further study. Bone repair strength, load to failure, and work to failure are tested by loading to failure on a specially designed steel 4-point bending jig attached to an Instron testing machine to quantitate bone strength, stiffness, energy absorbed and deformation to failure. The study of test femurs and normal femurs yield the bone strength (load) in pounds and work to failure in joules. Normal femurs exhibit a strength of 96 (±12) pounds. Osteogenic protein-implanted femurs exhibit 35 (±4) pounds, but when corrected for surface area at the site of fracture (due to the "hourglass" shape of the bone defect repair) this correlated closely with normal bone strength. Only one demineralized bone specimen was available for testing with a strength of 25 pounds, but, again, the strength correlated closely with normal bone when corrected for fracture surface area.

4. Histomorphometry/Histology

Following biomechanical testing the bones are immediately sliced into two longitudinal sections at the defect site, weighed, and the volume measured. One-half is fixed for standard calcified bone histomorphometrics with fluorescent stain incorporation evaluation, and one-half is fixed for decalcified hemotoxylin/eosin stain histology preparation.

5. Biochemistry

Selected specimens from the bone repair site (n=6) are homogenized in cold 0.15M NaCl, 3 mM NaHCO₃, pH 9.0 by a Spex freezer mill. The alkaline phosphatase activity of the supernatant and total calcium content of the acid soluble fraction of sediment are then determined.

6. Histopathology

The final autopsy reports reveal no unusual or pathologic findings noted at necropsy of any of the animals studied. A portion of all major organs are preserved for further study. A histophathological evaluation is performed on samples of the following organs: heart, lung, liver, both kidneys, spleen, both adrenals, lymph nodes, left and right quadriceps muscles at mid-femur (adjacent to defect site in experimental femur). No unusual or pathological lesions are seen in any of the tissues. Mild lesions seen in the quadriceps muscles are compatible with healing responses to the surgical manipulation at the defect site. Pulmonary edema is attributable to the euthanasia procedure. There is no evidence of any general systemic effects or any effects on the specific organs examined.

7. Feline Study Summary

The 1 cm and 2 cm femoral defect cat studies demonstrate that devices comprising a matrix containing disposed osteogenic protein can: (1) repair a weight-bearing bone defect in a large animal; (2) consistently induces bone formation shortly following (less than two weeks) implantation; and (3) induce bone by endochondral ossification, with a strength equal to normal bone, on a volume for volume basis. Furthermore, all animals remained healthy during the study and showed no evidence of clinical or histological laboratory reaction to the implanted device. In this bone defect model, there was little or no healing at control bone implant sites. The results provide evidence for the successful use of osteogenic devices to repair large, non-union bone defects.

C. Rabbit Model:

1. Procedure and Results

Eight mature (less than 10 lbs) New Zealand White rabbits with epiphyseal closure documented by X-ray were studied. The purpose of this study is to establish a model in which there is minimal or no bone growth in the control animals, so that when bone induction is tested, only a strongly inductive substance will yield a positive result. Defects of 1.5 cm are created in the rabbits, with implantation of: osteogenic protein (n=5), DBM (n=8), GuHCl-DBM (n=6), and no implant (n=10). Six osteogenic protein implants are supplied and all control defects have no implant placed.

Of the eight animals (one animal each was sacrificed at one and two weeks), 11 ulnae defects are followed for the full course of the eight week study. In all cases (n=7) following osteo-periosteal bone resection, the no implant animals establish no radiographic union by eight weeks. All no implant animals develop a thin "shell" of bone growing from surrounding bone present at four weeks and, to a slightly greater degree, by eight weeks. In all cases (n=4), radiographic union with marked bone induction is established in the osteogenic protein-implanted animals by eight weeks. As opposed to the no implant repairs, this bone is in the site of the removed bone.

Radiomorphometric analysis reveal 90% osteogenic protein-implant bone repair and 18% no-implant bone repair at sacrifice at eight weeks. At autopsy, the osteogenic protein bone appears normal, while "no implant" bone sites have only a soft fibrous tissue with no evidence of cartilage or bone repair in the defect site.

2. Allograft Device

In another experiment, the marrow cavity of the 1.5 cm ulnar defect is packed with activated osteogenic protein rabbit bone powder and the bones are allografted in an intercalary fashion. The two control ulnae are not healed by eight weeks and reveal the classic "ivory" appearance. In distinct contrast, the osteogenic protein-treated implants "disappear" radiographically by four weeks with the start of remineralization by six to eight weeks. These allografts heal at each end with mild proliferative bone formation by eight weeks.

This type of device serves to accelerate allograph repair.

3. Summary

These studies of 1.5 cm osteo-periosteal defects in the ulnae of mature rabbits show that: (1) it is a suitable model for the study of bone growth; (2) "no implant" or GuHCl negative control implants yield a small amount of periosteal-type bone, but not medullary or cortical bone growth; (3) osteogenic protein-implanted rabbits exhibited proliferative bone growth in a fashion highly different from the control groups; (4) initial studies show that the bones exhibit 50% of normal bone strength (100% of normal correlated vol:vol) at only eight weeks after creation of the surgical defect; and (5) osteogenic protein-allograft studies reveal a marked effect upon both the allograft and bone healing.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

    __________________________________________________________________________     #             SEQUENCE LISTING     - (1) GENERAL INFORMATION:     -    (iii) NUMBER OF SEQUENCES: 33     - (2) INFORMATION FOR SEQ ID NO:1:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1822 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: NO     -     (iv) ANTI-SENSE: NO     -     (vi) ORIGINAL SOURCE:               (A) ORGANISM: HOMO SAPI - #ENS               (F) TISSUE TYPE: HIPPOC - #AMPUS     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 49..1341               (C) IDENTIFICATION METHOD: - # experimental     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "OP1"     #               /evidence=- # EXPERIMENTAL     #               /standard.sub.-- - #name= "OP1"     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:1:     #CAC GTG      57AGCCCGG AGCCCGGGTA GCGCGTAGAG CCGGCGCG ATG     #                 Met - # His Val     # 1     - CGC TCA CTG CGA GCT GCG GCG CCG CAC AGC TT - #C GTG GCG CTC TGG GCA      105     Arg Ser Leu Arg Ala Ala Ala Pro His Ser Ph - #e Val Ala Leu Trp Ala     #      15     - CCC CTG TTC CTG CTG CGC TCC GCC CTG GCC GA - #C TTC AGC CTG GAC AAC      153     Pro Leu Phe Leu Leu Arg Ser Ala Leu Ala As - #p Phe Ser Leu Asp Asn     # 35     - GAG GTG CAC TCG AGC TTC ATC CAC CGG CGC CT - #C CGC AGC CAG GAG CGG      201     Glu Val His Ser Ser Phe Ile His Arg Arg Le - #u Arg Ser Gln Glu Arg     #                 50     - CGG GAG ATG CAG CGC GAG ATC CTC TCC ATT TT - #G GGC TTG CCC CAC CGC      249     Arg Glu Met Gln Arg Glu Ile Leu Ser Ile Le - #u Gly Leu Pro His Arg     #             65     - CCG CGC CCG CAC CTC CAG GGC AAG CAC AAC TC - #G GCA CCC ATG TTC ATG      297     Pro Arg Pro His Leu Gln Gly Lys His Asn Se - #r Ala Pro Met Phe Met     #         80     - CTG GAC CTG TAC AAC GCC ATG GCG GTG GAG GA - #G GGC GGC GGG CCC GGC      345     Leu Asp Leu Tyr Asn Ala Met Ala Val Glu Gl - #u Gly Gly Gly Pro Gly     #     95     - GGC CAG GGC TTC TCC TAC CCC TAC AAG GCC GT - #C TTC AGT ACC CAG GGC      393     Gly Gln Gly Phe Ser Tyr Pro Tyr Lys Ala Va - #l Phe Ser Thr Gln Gly     100                 1 - #05                 1 - #10                 1 -     #15     - CCC CCT CTG GCC AGC CTG CAA GAT AGC CAT TT - #C CTC ACC GAC GCC GAC      441     Pro Pro Leu Ala Ser Leu Gln Asp Ser His Ph - #e Leu Thr Asp Ala Asp     #               130     - ATG GTC ATG AGC TTC GTC AAC CTC GTG GAA CA - #T GAC AAG GAA TTC TTC      489     Met Val Met Ser Phe Val Asn Leu Val Glu Hi - #s Asp Lys Glu Phe Phe     #           145     - CAC CCA CGC TAC CAC CAT CGA GAG TTC CGG TT - #T GAT CTT TCC AAG ATC      537     His Pro Arg Tyr His His Arg Glu Phe Arg Ph - #e Asp Leu Ser Lys Ile     #       160     - CCA GAA GGG GAA GCT GTC ACG GCA GCC GAA TT - #C CGG ATC TAC AAG GAC      585     Pro Glu Gly Glu Ala Val Thr Ala Ala Glu Ph - #e Arg Ile Tyr Lys Asp     #   175     - TAC ATC CGG GAA CGC TTC GAC AAT GAG ACG TT - #C CGG ATC AGC GTT TAT      633     Tyr Ile Arg Glu Arg Phe Asp Asn Glu Thr Ph - #e Arg Ile Ser Val Tyr     180                 1 - #85                 1 - #90                 1 -     #95     - CAG GTG CTC CAG GAG CAC TTG GGC AGG GAA TC - #G GAT CTC TTC CTG CTC      681     Gln Val Leu Gln Glu His Leu Gly Arg Glu Se - #r Asp Leu Phe Leu Leu     #               210     - GAC AGC CGT ACC CTC TGG GCC TCG GAG GAG GG - #C TGG CTG GTG TTT GAC      729     Asp Ser Arg Thr Leu Trp Ala Ser Glu Glu Gl - #y Trp Leu Val Phe Asp     #           225     - ATC ACA GCC ACC AGC AAC CAC TGG GTG GTC AA - #T CCG CGG CAC AAC CTG      777     Ile Thr Ala Thr Ser Asn His Trp Val Val As - #n Pro Arg His Asn Leu     #       240     - GGC CTG CAG CTC TCG GTG GAG ACG CTG GAT GG - #G CAG AGC ATC AAC CCC      825     Gly Leu Gln Leu Ser Val Glu Thr Leu Asp Gl - #y Gln Ser Ile Asn Pro     #   255     - AAG TTG GCG GGC CTG ATT GGG CGG CAC GGG CC - #C CAG AAC AAG CAG CCC      873     Lys Leu Ala Gly Leu Ile Gly Arg His Gly Pr - #o Gln Asn Lys Gln Pro     260                 2 - #65                 2 - #70                 2 -     #75     - TTC ATG GTG GCT TTC TTC AAG GCC ACG GAG GT - #C CAC TTC CGC AGC ATC      921     Phe Met Val Ala Phe Phe Lys Ala Thr Glu Va - #l His Phe Arg Ser Ile     #               290     - CGG TCC ACG GGG AGC AAA CAG CGC AGC CAG AA - #C CGC TCC AAG ACG CCC      969     Arg Ser Thr Gly Ser Lys Gln Arg Ser Gln As - #n Arg Ser Lys Thr Pro     #           305     - AAG AAC CAG GAA GCC CTG CGG ATG GCC AAC GT - #G GCA GAG AAC AGC AGC     1017     Lys Asn Gln Glu Ala Leu Arg Met Ala Asn Va - #l Ala Glu Asn Ser Ser     #       320     - AGC GAC CAG AGG CAG GCC TGT AAG AAG CAC GA - #G CTG TAT GTC AGC TTC     1065     Ser Asp Gln Arg Gln Ala Cys Lys Lys His Gl - #u Leu Tyr Val Ser Phe     #   335     - CGA GAC CTG GGC TGG CAG GAC TGG ATC ATC GC - #G CCT GAA GGC TAC GCC     1113     Arg Asp Leu Gly Trp Gln Asp Trp Ile Ile Al - #a Pro Glu Gly Tyr Ala     340                 3 - #45                 3 - #50                 3 -     #55     - GCC TAC TAC TGT GAG GGG GAG TGT GCC TTC CC - #T CTG AAC TCC TAC ATG     1161     Ala Tyr Tyr Cys Glu Gly Glu Cys Ala Phe Pr - #o Leu Asn Ser Tyr Met     #               370     - AAC GCC ACC AAC CAC GCC ATC GTG CAG ACG CT - #G GTC CAC TTC ATC AAC     1209     Asn Ala Thr Asn His Ala Ile Val Gln Thr Le - #u Val His Phe Ile Asn     #           385     - CCG GAA ACG GTG CCC AAG CCC TGC TGT GCG CC - #C ACG CAG CTC AAT GCC     1257     Pro Glu Thr Val Pro Lys Pro Cys Cys Ala Pr - #o Thr Gln Leu Asn Ala     #       400     - ATC TCC GTC CTC TAC TTC GAT GAC AGC TCC AA - #C GTC ATC CTG AAG AAA     1305     Ile Ser Val Leu Tyr Phe Asp Asp Ser Ser As - #n Val Ile Leu Lys Lys     #   415     - TAC AGA AAC ATG GTG GTC CGG GCC TGT GGC TG - #C CAC TAGCTCCTCC     1351     Tyr Arg Asn Met Val Val Arg Ala Cys Gly Cy - #s His     420                 4 - #25                 4 - #30     - GAGAATTCAG ACCCTTTGGG GCCAAGTTTT TCTGGATCCT CCATTGCTCG CC - #TTGGCCAG     1411     - GAACCAGCAG ACCAACTGCC TTTTGTGAGA CCTTCCCCTC CCTATCCCCA AC - #TTTAAAGG     1471     - TGTGAGAGTA TTAGGAAACA TGAGCAGCAT ATGGCTTTTG ATCAGTTTTT CA - #GTGGCAGC     1531     - ATCCAATGAA CAAGATCCTA CAAGCTGTGC AGGCAAAACC TAGCAGGAAA AA - #AAAACAAC     1591     - GCATAAAGAA AAATGGCCGG GCCAGGTCAT TGGCTGGGAA GTCTCAGCCA TG - #CACGGACT     1651     - CGTTTCCAGA GGTAATTATG AGCGCCTACC AGCCAGGCCA CCCAGCCGTG GG - #AGGAAGGG     1711     - GGCGTGGCAA GGGGTGGGCA CATTGGTGTC TGTGCGAAAG GAAAATTGAC CC - #GGAAGTTC     1771     #           1822CACAATA AAACGAATGA ATGAAAAAAA AAAAAAAAAA A     - (2) INFORMATION FOR SEQ ID NO:2:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 431 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:2:     - Met His Val Arg Ser Leu Arg Ala Ala Ala Pr - #o His Ser Phe Val Ala     #                 15     - Leu Trp Ala Pro Leu Phe Leu Leu Arg Ser Al - #a Leu Ala Asp Phe Ser     #             30     - Leu Asp Asn Glu Val His Ser Ser Phe Ile Hi - #s Arg Arg Leu Arg Ser     #         45     - Gln Glu Arg Arg Glu Met Gln Arg Glu Ile Le - #u Ser Ile Leu Gly Leu     #     60     - Pro His Arg Pro Arg Pro His Leu Gln Gly Ly - #s His Asn Ser Ala Pro     # 80     - Met Phe Met Leu Asp Leu Tyr Asn Ala Met Al - #a Val Glu Glu Gly Gly     #                 95     - Gly Pro Gly Gly Gln Gly Phe Ser Tyr Pro Ty - #r Lys Ala Val Phe Ser     #           110     - Thr Gln Gly Pro Pro Leu Ala Ser Leu Gln As - #p Ser His Phe Leu Thr     #       125     - Asp Ala Asp Met Val Met Ser Phe Val Asn Le - #u Val Glu His Asp Lys     #   140     - Glu Phe Phe His Pro Arg Tyr His His Arg Gl - #u Phe Arg Phe Asp Leu     145                 1 - #50                 1 - #55                 1 -     #60     - Ser Lys Ile Pro Glu Gly Glu Ala Val Thr Al - #a Ala Glu Phe Arg Ile     #               175     - Tyr Lys Asp Tyr Ile Arg Glu Arg Phe Asp As - #n Glu Thr Phe Arg Ile     #           190     - Ser Val Tyr Gln Val Leu Gln Glu His Leu Gl - #y Arg Glu Ser Asp Leu     #       205     - Phe Leu Leu Asp Ser Arg Thr Leu Trp Ala Se - #r Glu Glu Gly Trp Leu     #   220     - Val Phe Asp Ile Thr Ala Thr Ser Asn His Tr - #p Val Val Asn Pro Arg     225                 2 - #30                 2 - #35                 2 -     #40     - His Asn Leu Gly Leu Gln Leu Ser Val Glu Th - #r Leu Asp Gly Gln Ser     #               255     - Ile Asn Pro Lys Leu Ala Gly Leu Ile Gly Ar - #g His Gly Pro Gln Asn     #           270     - Lys Gln Pro Phe Met Val Ala Phe Phe Lys Al - #a Thr Glu Val His Phe     #       285     - Arg Ser Ile Arg Ser Thr Gly Ser Lys Gln Ar - #g Ser Gln Asn Arg Ser     #   300     - Lys Thr Pro Lys Asn Gln Glu Ala Leu Arg Me - #t Ala Asn Val Ala Glu     305                 3 - #10                 3 - #15                 3 -     #20     - Asn Ser Ser Ser Asp Gln Arg Gln Ala Cys Ly - #s Lys His Glu Leu Tyr     #               335     - Val Ser Phe Arg Asp Leu Gly Trp Gln Asp Tr - #p Ile Ile Ala Pro Glu     #           350     - Gly Tyr Ala Ala Tyr Tyr Cys Glu Gly Glu Cy - #s Ala Phe Pro Leu Asn     #       365     - Ser Tyr Met Asn Ala Thr Asn His Ala Ile Va - #l Gln Thr Leu Val His     #   380     - Phe Ile Asn Pro Glu Thr Val Pro Lys Pro Cy - #s Cys Ala Pro Thr Gln     385                 3 - #90                 3 - #95                 4 -     #00     - Leu Asn Ala Ile Ser Val Leu Tyr Phe Asp As - #p Ser Ser Asn Val Ile     #               415     - Leu Lys Lys Tyr Arg Asn Met Val Val Arg Al - #a Cys Gly Cys His     #           430     - (2) INFORMATION FOR SEQ ID NO:3:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 17410 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: DNA (genomic)     -     (vi) ORIGINAL SOURCE:               (A) ORGANISM: homo sapi - #ens     -     (ix) FEATURE:               (A) NAME/KEY: exon               (B) LOCATION: 3192..3730     #/label= EXON-1THER INFORMATION:     #"START CODON BEGINS AT POSITION     #     3313"     -     (ix) FEATURE:               (A) NAME/KEY: misc.sub.-- - #feature               (B) LOCATION: 10413..10414     #/label= GAP-1OTHER INFORMATION:     # BASES ARETELY .sub.-- .sub.-- .sub.-- .sub.-- .sub.--     #    ESTIMATED TO BE MISSING BETWEEN     #    POSITIONS 10413 AND 10414 IN     #    THIS SEQUENCE."     -     (ix) FEATURE:               (A) NAME/KEY: exon               (B) LOCATION: 10696..10891     #/label= EXON-2THER INFORMATION:     -     (ix) FEATURE:               (A) NAME/KEY: misc.sub.-- - #feature               (B) LOCATION: 10960..10961     #/label= GAP-2OTHER INFORMATION:     #"APPROXIMATELY .sub.-- .sub.-- .sub.-- .sub.--  BA - #SES ARE ESTIMATED     TO                    BE MISSIN - #G BETWEEN POSITION 10960 AND 10961 IN                    THIS SEQU - #ENCE."     -     (ix) FEATURE:               (A) NAME/KEY: exon               (B) LOCATION: 11059..11211     #/label= EXON-3THER INFORMATION:     -     (ix) FEATURE:               (A) NAME/KEY: misc.sub.-- - #feature               (B) LOCATION: 11351..11352     #/label= GAP-3OTHER INFORMATION:     #"APPROXIMATELY .sub.-- .sub.-- .sub.-- .sub.--  BA - #SES ARE     #    ESTIMATED TO BE MISSING BETWEEN     #    POSITIONS 11351 AND 11352 IN     #    THIS SEQUENCE."     -     (ix) FEATURE:               (A) NAME/KEY: exon               (B) LOCATION: 11420..11617     #/label= EXON-4THER INFORMATION:     -     (ix) FEATURE:               (A) NAME/KEY: misc.sub.-- - #feature               (B) LOCATION: 11721..11722     #/label= GAP-4OTHER INFORMATION:     #"APPROXIMATELY .sub.-- .sub.-- .sub.-- .sub.--  BA - #SES ARE     #    ESTIMATED TO BE MISSING BETWEEN     #    POSITIONS 11721 AND 11722 IN     #    THIS SEQUENCE."     -     (ix) FEATURE:               (A) NAME/KEY: exon               (B) LOCATION: 13354..13436     #/label= EXON-5THER INFORMATION:     -     (ix) FEATURE:               (A) NAME/KEY: exon               (B) LOCATION: 15044..15160     #/label= EXON-6THER INFORMATION:     -     (ix) FEATURE:               (A) NAME/KEY: exon               (B) LOCATION: 17245..17410     #/label= EXON-7THER INFORMATION:     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:3:     - TCAACCGGTC TCTTTAGGTT TTGGCTGTGC TTATTACTAT TCATTCAACA GG - #TACTAATT       60     - GAGCACCTGC TGTGTGCCAG GCTCAGAATA GGCTCAGGTG AGATGCACAA AG - #AAGGGTAA      120     - ACTAGAATCC TTGCTTAGAC ACTGACGGAT CAGTTGTTTC ATATGTAAAT TG - #TAGCACCA      180     - AGACCTGCTG CCCCTGCCCC CAGCCTCACC TGCTTGTGAA GATCCCTCCA AA - #AGATTTGA      240     - GAGTAGATAA AAAGCAGAGA CTACTACTGA AGAACAGGGC TGCTTTGGCT CC - #TTATTATT      300     - TCAGACTTTG GAAGAAAATG ACCTCCTTTT TCTCTACTGG CACTGAGTGC AT - #AGCTGACC      360     - TAGCAAGCCA GGCCTGGAGG GCGTGTGCAG GGCTGGGGAC CGAGCCTGGT TT - #CTGTTCCC      420     - TGCTCTGCAG CTCAAGCACT TGCTGTTCCT CCACCTGGGA TGCCTTTCCC TG - #GAAAAGCC      480     - TGTCTCTTTC TTGTCTTTCA GGACTCAGGT CAGTGGCATC TCCTCCAAAA AC - #TCCCCTTC      540     - CCACCCTCCA TCACCTCACC CTGTTTATCT GCGCCCCCGC CCCCACTGCC TG - #TCACTTAT      600     - TGCAGGCTGA AGTGACCCAG GCTCTCCAGT TGTACACTCT CAGATGGACC CT - #GGACGACT      660     - GTGGCACTCC TGCAATTTCC CCAGTCTCCC TGGGGTAGGA TTCCTGCTTG CC - #AGGATGCC      720     - CACCTTTCCT TCTCCCTCCT GCATGTCCTC CTCTGCCTGG CTTCTGAATT GT - #TTCCAGAG      780     - AGAGTGATAG ACAAGATCTG CCTCTCCTTC AGTCCCTGAA TCTTATTTAA GG - #CTCTTGCT      840     - TTGCTTCCTG GCTGGAGGCG GCTCTTGATG GAGTCTGCCA TGTGGGTTCG CT - #CATGGCCA      900     - TGTCTTCCTG CCCAGCATGG TGCTTGGCCC TGGGACTGGC CACATAATAT CT - #GGGCCAGG      960     - TGCAAAATTA GTACGGGGCA GGGGGTACTT TGTTCATAGG TGATTCAGAA CC - #ACATATGG     1020     - TGACCTCAGA GTAGGAAACC AAGTGTGGGG CCCTTAAGAG CTGGGGGGCC CT - #GTACGACT     1080     - GTCCAGGTTG CAGGCCCCAC AGCTCGCCTC CTGATATCCT GTGCTCCATG CT - #TGTCTGTT     1140     - GAAGGAAGGA GTGAATGGAT GAAGAGCAGG TGGTGGGGGG TGGTTTGAGG GC - #CTTGCTGG     1200     - TGGGTGGGTA GAGGCCCCTC CCTGGCATGG GGCTCAAGAC CTGTTCCATC CC - #ACAGCCTG     1260     - GGGCCTGTGT GTAAATGGCC AGGACCTGCA GGCTGGCATT TTTCTGCTCC TT - #GCCTGGCT     1320     - CTGGCTCCCC TTTCTCCACC CATGTGGCCC CTCAGGCTGC CATCTAGTCC AA - #AAGTCCCA     1380     - AGGGAGACCC AGAGGCCACT TGGCAAACTA CTTCTGCTCC AGAAAACTGT AG - #AAGACCAT     1440     - AATTCTCTTC CCCAGCTCTC CTGCTCCAGG AAGGACAGCC CCAAAGTGAG GC - #TTAGCAGA     1500     - GCCCCTCCCA GACAAGCGCC CCCGCTTCCC CAACCTCAGC CCTTCCCAGT TC - #ATCCCAAA     1560     - GGCCCTCTGG GGACCCACTC TCTCACCCAG CCCCAGGAGG GAAGGAGACA GG - #ATGAACTT     1620     - TTACCCCACC CCGCTGCCCT CACTGCCACT CTGGGTGCAG TAATTCCCTT GA - #GATCCCAC     1680     - ACCGGCAGAG GGACCGGTGG GTTCTGAGTG GTCTGGGGAC TCCCTGTGAC AG - #CGTGCATG     1740     - GCTCGGTATT GATTGAGGGA TGAATGGATG AGGAGAGACA GGAGAGGAGG CC - #GATGGGGA     1800     - GGTCTCAGGC ACAGACCCTT GGAGGGGAAG AGGATGTGAA GACCAGCGGC TG - #GCTCCCCA     1860     - GGCACTGCCA CGAGGAGGGC TGATGGGAAG CCCTAGTGGT GGGGCTGGGG TG - #TCTGGTCT     1920     - CAGGCTGAGG GGTGGCTGGA AAGATACAGG GCCCCGAAGA GGAGGAGGTG GG - #AAGAACCC     1980     - CCCCAGCTCA CACGCAGAAC ACTTATTCAC TCAACAAATC GTGACTGCGC AC - #GTACAGTG     2040     - GCTACCAGGC GCTGGGTTCA AGGCACTGCG GGTACCAGAG GTGCGGAGAA GA - #TCGCTGAT     2100     - CCGGGCCCCA GTGCTCTGGG TGTCTAGCGG GGGTAAGAAG GCAATAAAGA AG - #GCACGGAG     2160     - TAACTCAAAC AGCAATTCCA GACAGCAAGA GAAACTACAG GAAAGAAAAC AA - #ACGTGCGA     2220     - GGGGCGAGGC GAGGAAACAA CCTCAGCTTG GCAGGTCTTG GAGGTCTCTG GG - #AGGAGAAA     2280     - GCAGCGTCTG ATGGGGGCGG GAGGTGGTGA GTGGGGAGAG GTCCAGGCGG AG - #GGAATGGC     2340     - GAGCGAGAGA CAGGCTGGCA ACGGCTTCAG GGAGGCGCGG AGGGGTCAGC GT - #GGCTGGCT     2400     - TAAAAGGATA CATGGGACTA GGGGCAAGAC CGGCTCAAGG TCACCGCTTC CA - #GGACCTTC     2460     - TATTTCCGCG CCATTATTGC CACCTCCGCG CTCCCCCAAC TTTTCCCACC GC - #GGTCCGCA     2520     - GCCCACCCGT CCTGCTCGGG CCGCCTTCCT GGTCCGGACC GCGAGTGCCG AG - #AGGCAGGG     2580     - CGGCTCCGAT TCCTCCAGCC GCATCCCCGC GACGTCCCGC CAGCTCTAGG CA - #CCCCGTGG     2640     - CACTCAGTAA ACATTTGTCG AGCGCTCTAG AGGGAATGAA TGAACCCACT GG - #GCACAGCT     2700     - GGGGGGAGGG CGGGGCGAGG GAGGTGGGAG GCCGCCGGCG CGGAGGGGCC CC - #TCGAAGCC     2760     - CGTCCTCCTC CTCCTCCTCC TCCGCCCAGG CCCCAGCGCG TACCACTCTG GC - #GCTCCCGA     2820     - GGCGGCCTCT TGTGCGATCC AGGGCGCACA AGGCTGGGAG AGCGCCCCGG GG - #CCCCTGCT     2880     - ATCCGCGCCG GAGTTGGAAG AGGGTGGGTT GCCGCCGCCC GAGGGCAGAC GG - #CCAGAGGA     2940     - GCGGAAGAAG GAGCGCTCGC CCGCCCGCCT GCCTCCTCGC TGCCTCCCCG GC - #GTTGGCTC     3000     - TCTGGACTCC TAGGCTTGCT GGCTGCTCCT CCCACCCGCG CCCGCCTCCT CA - #CTCGCCTT     3060     - TTCGTTCGCC GGGGCTGCTT TCCAAGCCCT GCGTGCGCCC GGGGAGTGCG GG - #GCGAGGGG     3120     - CCGGGGCAGC ACCGAGCAGG GGGCGGGGGT CCGGGCAGAC GCGCCGGCCG GG - #GAGGGGCC     3180     - ATGTCTGGCG CGGGCGAGCG GGGCCCGTCT GCAGCAAGTG ACCGACGGCC GG - #GACGGCCG     3240     - CCTGCCCCCT CTGCCACCTG GGGCGGTGCG GGCCCGGAGC CCGGAGCCCG GG - #TAGCGCGT     3300     - AGAGCCGGCG CGATGCACGT GCGCTCACTG CGAGCTGCGG CGCCGCACAG CT - #TCGTGGCG     3360     - CTCTGGGCAC CCCTGTTCCT GCTGCGCTCC GCCCTGGCCG ACTTCAGCCT GG - #ACAACGAG     3420     - GTGCACTCGA GCTTCATCCA CCGGCGCCTC CGCAGCCAGG AGCGGCGGGA GA - #TGCAGCGC     3480     - GAGATCCTCT CCATTTTGGG CTTGCCCCAC CGCCCGCGCC CGCACCTCCA GG - #GCAAGCAC     3540     - AACTCGGCAC CCATGTTCAT GCTGGACCTG TACAACGCCA TGGCGGTGGA GG - #AGGGCGGC     3600     - GGGCCCGGCG GCCAGGGCTT CTCCTACCCC TACAAGGCCG TCTTCAGTAC CC - #AGGGCCCC     3660     - CCTCTGGCCA GCCTGCAAGA TAGCCATTTC CTCACCGACG CCGACATGGT CA - #TGAGCTTC     3720     - GTCAACCTCG GTGAGTAAGG GCAGGCGAGG GTACGCCGTC TCCTTTCGGG GG - #CACTTTGA     3780     - GACTGGGAGG GAGGGAGCCG CTTCTTCTAT GCAGCCCGCC CAGCTTTCCG CT - #CCTGGCTG     3840     - AAATCGCAGT GCCTGCCCGA GGGTCTCCCA CCCACAGCCC TATGACTCCC AA - #GCTGTGTG     3900     - CGCCCCCAGG TCGGGCCGCT GGGTCGGTGA GCCTGTAGGG GTTACTGGGA AG - #GAGGGATC     3960     - CTCCGAAGTC CCCTCCATGT TACGCCGCCG GCCGCATCTC TGGGGCTGGA GG - #CAAGGGCG     4020     - TTCAAAGCGC GGGGCTCGGT CATGTGAGCT GTCCCGGGCC GGCGCCGGTC CG - #TGACCTGG     4080     - ATGTAAAGGG CCCTTCCCGG CGAGGCTGCC TTGCCGCCCT TCCTGGGCCC CT - #CTCAGCCC     4140     - TGCCTGGCTC TGGCATCGCG GCCGTCGCAC CCCCTTACCC TCCCTGTCAA GC - #CCTACCTG     4200     - TCCCCTCGTG GTGCGCCCGC CTTAGGCTAC CGGCCGCTCC GAGCCTTGGG GC - #CCCTCTCC     4260     - GGGCGCCGAT GCCCCATTCT CTCTTGGCTG GAGCTGGGGA AGAAACGGTG CC - #ATTGCTAA     4320     - TTTTCTTTGT TTTCTTTCTT TGTTTATTTT TTTCTTTTTT CTTTTTTTTT CT - #TTTCTTTT     4380     - CTTTTCTTTT TTTTTTTTTT TGAGACGGAG TTTCACTCTT GCTCGCCCAG AC - #TGGAGTGC     4440     - AATGGCGCGA TCTCTGCTCA CCGCAACCTC TGCCTCCCGG GTTCAAGCGA TT - #CTCGTGCC     4500     - TCAGCCTCCC GAGTAGCTGG GATTACAGGC ATGCGCACCA TGCCTGGCTA AT - #TTTGTATT     4560     - TTAGTAGAGA CAGGGTTTCT CCATGTTAGG CAGGCTGGTC TCGAACTCCC GA - #TCTCAGGT     4620     - GATCCTCCCG CCTCAGCCTC CCAAAGTGGT GCTGGGATTA CAGGCGTGAA GC - #TGTGCCCT     4680     - GCCGCTAGTC TTCTATTTTA AGTATTTAGT GGTAGGTCCC GGGCCGGCAG AA - #TCTATTTT     4740     - CAGCATTTAC CACGTGTGGC GCGCAAACCA CAGGTTTTGG CGATTGGGTT GC - #GCGGGATC     4800     - TCAGAGCTGA CGACCGCGGG GGCCTGGGGG TCCCGGTTTC CGACTGGAGC CG - #CGACGACC     4860     - CCGGCGACGG CAGCCTGGGG CTGCAGCCGA GGGCCGGGGA GCTCCCCCTC CA - #TATGTGCG     4920     - CGCACATTCT CCAGACTTGC TCAAACTAAC CCCCCGGAGC AGCGCACGGG CT - #GGGACTGA     4980     - TGATCAAATA TTTGGTTTCC GAGATAACAC ACCCCGATAG CGCTGTTTCC TG - #AGCCGCTT     5040     - TCATTCTACT TGTGTAACTT GCTGCGAAAA CCCGAACCAA GTCAAGACAG CA - #AACTCACG     5100     - CCCACGGGCC TGTGTCAACA TGGAAATAAT GATACTGAAG CCCCACGCTG GG - #CACCTGGG     5160     - GCGTGGACTG GGGGCGCGGG GGAAGCGCAG ATCCGCCTTC ATGCTTCCCC TC - #CTCCTGAT     5220     - AAGGTCCCTG GAGTTCCCGG GAGCCATTGT CTGTACTTAA TAATAACTAA AT - #CCAACTAG     5280     - TGAACCAAGC TTCAGCGAGG CAAGGGGAGG GAGGTTTAGA TGCCAAAATT AC - #CTTCAAAA     5340     - AAGTTTAAAT TATACTAAGC AGCCAGTTAA GAAGGAAGCA GCAATATATG AC - #CTGATTTA     5400     - GAACCATCTC CAAGATGTAT GAGGTGGAAA GAAGCAAGGT GCAGATGAGT GG - #GCTGCATG     5460     - TGTGCTTGTA TATCATCGTG TCCTCCTGGA GGAAGACACC AGGAACTGGA GA - #GAGATTTT     5520     - ACTGGAGGGG TATATGGCGG GGGCATAGCT GGGGCTTACG GAGTGGGAGG TG - #GGGTCTGA     5580     - TTTTTCGTCG TCTGCACTTC TGTATTTGTG ATTTTTTTAA AACAATGTGT AT - #TTATTAAC     5640     - TATACCAAAA AATAAAGGAA AATTCCAAAT ACATACATAT AAATAATGAA CC - #GCAGAGCT     5700     - CTGTCGCCCT CCTGAAGCCT GGGGTTAGCC AGGGCCCTTT CTCTGGTGGG GG - #ATTTATAG     5760     - CATCTTCCCT TCTGTTGGGT ACCCCGGACT CCCACTGAAT GTGCAGGTCC CA - #GTGGCTGC     5820     - CTTCAGAGCC TGGCTGGAAT CATTAAAAAG GTATTTGTAA TCTCTGGCTT CT - #GCAGAAGG     5880     - CCCTGCAAAC CAAGAGCAAA AAAGCCCCCA GTGCTTATGG GCCGGCAGTG TG - #GGCTAGGC     5940     - CCGGGGCTCC CTGTCCCCAA GAGAAAGACC AGGTTGCTCG GAGGGTGCCT CT - #GGGAACTT     6000     - TGGTGCGGGC TATTTGCTCC CCCCATGGCG GCAGGAGCAA GCTGGGACTT GT - #TTGGGAAG     6060     - GCCACAGCTG GGTGGTTTTC CTCCTCTGGC TGTACATACA CCTTTCAATC CA - #TTTCTTTC     6120     - ATCTTGAAAG GACAAAGACC GGCTTGTCTG AGCCTCTTAA TCAGTCAGGC TG - #GCTTTGGG     6180     - CTTTGGGGAC CCTGACTTTC TCAGGTCTAG CTTTCTGGGA CATCACTCCA AA - #TTAGATGG     6240     - CAGAGTGGCT TTTAACAGAG CGCACTGACC TTGTTTTCTT TCTCTCTCTG TC - #CCTAAACT     6300     - CGAGGTCATT AGTTAGGTGA AGACCTGGGC TGCAGTTTGG CGAGACACTT CC - #TGTAGATG     6360     - CTTCTAATGT TGGCCTTTAA TTTCTGCTAA GCAGCAGCAC ACAAATAAAT GG - #CCTGTCCC     6420     - TTCTATCCTG TTGTAGCTTG GAATTTCTCC ATAGGAGGGA CTTGGGGGTG GC - #AGTAGGGT     6480     - TGGAGAGGGT TGGGGGGAGG TGTAGGAGAC TTGTCTGGCC ACTGAGTTTG CT - #GAGAAAGT     6540     - ACTGCTATAG TGTTTTTCCT TGGATTGCAA ATCATGTTGA TCTGAACTGC TG - #ATTTGAAG     6600     - TGGATTGAGA GGATGGAACA ATAGAAGGAG GATATGGCTC AGGACAGTCA AG - #TACTGGAA     6660     - GAGGGAAAGG TACAAAGAGG TGTTGGCACT GAATGACCCT GAACAGGGCT GC - #CCTGGAAA     6720     - TATCAGAGGT GAGTGACAAA GAGAACTCTA GTCGAAGGTC TGGAAGTCAA TT - #ATTGTCTC     6780     - CAGCTTTTGT CCCACCCTAA GGGATGGAGC ATGAACTTCA TGCATGTAAC AT - #CCCTCCAG     6840     - GAGCGCTGAG GTTCTGGGAA TTCCCAGTGC TGGCTACCAT GCCATTCTTT TC - #TCATTCAC     6900     - TCAAGAGCGT ATTGGGATAT GCGTGCATGA AAGCAATGTA ATTATGGGCA CA - #ACCTCAAA     6960     - ACCTGCTCTA ATTTTTTTTT TTTTTGGAGA TGGAGTCTCG CTCCATCACC CA - #GGCTGGAG     7020     - TGCAATGGCG CGATCTCAGC TCACTGCAAG CTCAGACCTC CAGGGTTCAC AC - #CATTCTCC     7080     - TGCCTCAGCC TCCCGAGTAG CTGGGAATAC AGGCGCCCGC ACCATGCGCG GC - #TAATTTTT     7140     - TTGTATTTTT AGTAGAGACG GGGTTTCACT GTGTTAGCCA GGATGGTCTC GA - #TCTCCTGA     7200     - CCTCGTGATC CACCCGCCTC GGCCTCCCAA AGTTCTGGGA TTACAGGCGT GA - #CAGCCGTG     7260     - CCCGGAATCT GCTCTAATTT TTTAAAGATA TCATTTGCAA ACTTTGGGCA CT - #TGAGTCAC     7320     - TCAGTAAGAT ATTATTTACA ACCCCACCAT AGATTCAAAC CTCTGTCCTA GA - #ATGTTGTC     7380     - GAGTTAGGCA TCTGGCTTGC AGCAACAGCT GGCTTTCCTG TCTATGCTGT CT - #CCTTCCAG     7440     - GGAGGATGTT TCACCCTTCA TATTGAGGAA ATGGGCACAG AGAACCCATT TC - #TCTTACTC     7500     - ATCATGTAAC TTCAGTGGGA TGGTCAGATC TATCTTTAAC CTGGCCACTC TT - #CCACAAGC     7560     - TCACACTGAC TCCAGCAAGA TCTTAAACTA GAAGGCAGGA GTTCAAATCC TA - #GCTGGTGC     7620     - AGTGGCCAAA TCTCGGCTCA CAGCACCTTC TGCCTCCTGG GCTCAAGCGA TC - #CTCTGACC     7680     - TCAGTCTCCC AAGTAGCTGG GACCATAGGC ATGCACCACT ATGCCTGGCT AA - #TTTTTGTA     7740     - TTTTTGTAAT TTTTTGTAGA GACAGAGTTT CACCATGTTG CCCAGCCCAG TC - #TTGAACTC     7800     - CTGGACTCAA GCAATCTTCC CACCTTTGCC TACCAGAGTG CCGGGATTAC AG - #GTGTGAGC     7860     - CATCATGCTA GTTGCGCACA GTTGGGCGAA ACTGACAGAT GAGAAAGCAG AA - #CCTCGTGA     7920     - GTCCACTCAG TAAGAGACTC CCTACTTTCT TTCTGAGTCT TTGTTTCTCA TC - #AATTGAAT     7980     - GGCAATAAAC AACTTGGTGG CCCAAGAGTT GATGACAACA GTCCTATAAG AT - #TATACATG     8040     - TAAAAGAAAC AGAGTATTCT ACAAATATCA GTTATTGATA GTTCAATAGG CA - #ACCTGACA     8100     - TTACCTTTTC TTGGAACTTG ATGAACAACT CAGAAACTCA TTAATATCAA AC - #CCAATGGT     8160     - GAGCACTTGG TCTTTATTTA TGGCTGTAAG AGAAGAAATT GAATTAACTC TA - #TGTAAATG     8220     - CCAACTAAGA ACATCGAAGT CTGAAATCAA CAGTTTTCCT CGCTCATACG AC - #ACACCCAA     8280     - ACTCAAGCAG TGGTTCCAAG CCCCTTTGGA AAATACCATG GGCTAACGAC TT - #TAAAAGCT     8340     - TAGAAGTGAA TTCTACTTAC TTATTACTTA AAAGTGGTTC TCAAACTTCA AG - #GTGAATCA     8400     - AAATCATCTG TAGAGCTTGT TAAAACACAG GTTGCTGGTC CACCCCAAGA GT - #GTCTTGAG     8460     - TCAGTAGGTC TCAAGTAGGG CTCAAGAATA TGCATTTCTA ATGAGCTCCA GG - #TGAGTCTA     8520     - AGTGTTAGTC GTCGGTCTTG GGACCACAAC TTTGGGAACA ATTGATTTAG AA - #GAACTCAA     8580     - AGATCAGAAA GGGGTGGAAT ATTTTTAAAA TTGTGGTAAA ATACGCATAA AC - #AGAAAAGG     8640     - TACAATTTTA ACCACTTAGA GAGAGGTGGG ATCTAAGAAC AGAAATTGTT AT - #GCCATCAA     8700     - AGGTGAGTTC AGATAAGCAT TATTAAATGG TATCTATGGA TAAACTTCAG GG - #GCCCTGTG     8760     - GAGCAACCCA ATGCTGGGAT GGGGTCCAGG TGTGCTATGG TTTGGATGTG GT - #TTGTCCCT     8820     - ACAAAAACTC ATGTTGAAAT TTAATTGCCA GTGTAACATT ATTGAGAGGT TA - #TGGACTTT     8880     - TAAGAGGCAT TTGGGTCATG AGGGATCCAC CTTCAGGGAT TAGTGCAGTC TC - #CAGGGAGT     8940     - GAGTGAGTTC CCATTCTAGT GGGACTGGAT TAGTTACCAT ACAGTGGTTG TT - #ATAAAGTG     9000     - AGGCTGCTTC TGGTGTTTTA TCTGTTTGCA GGCACTTCCT TCCCCTTCCA CT - #TCTCTGCC     9060     - AGGTTAGGAT GCAGCATGAG GCCCTCACCA GAAGCTGACC AGATGTGGCT GC - #CTGATCTT     9120     - GAACTTCCCA GTCCCCAGAA CCATGAGCTA AATAAACCTT TTTTCTCTAT AA - #ATTACGCA     9180     - GTCTAGAGTA TTCTATTATA GCAACACAAG ACAGACTAAG ACACAGTGGT AG - #AAAGAACA     9240     - CTACTGACTT CTCCCATACT CTGGCCTATG GACAAGAGTG ACAGACAGAC AA - #GAGTGAAT     9300     - ATCAGGGCCC TCAGGCACAT TCCTCTCTGC CCCTTCCTCC CTTCTTGCAG AG - #TCTCCAGT     9360     - GACTGCCAGC TAATGCTATC ATAGACCCCA CCTTTCCCCT GACTTGATTG GA - #CCAGAAGC     9420     - AGCCTCCTGA TCCATGGCCA ACAATCAGAT TCACTTTCAA GAATTTGAAC TA - #AGAGACAC     9480     - TAGGAAGATG GCCCTTGAGC TGTGAGTCCT ACACTTGAAA GTTCTTAGCA TC - #TTGGTCAG     9540     - GTACCCACCA GGGCCATGTG CAAACTGAGA TAATGGGGAC ATGGAACAAG GG - #TAAGTGGA     9600     - GAGGGCTGGC TGGAGAGAGA CGGGCAGAGG AAAGCCCTGC CAAGAGGAGC AG - #AGATGAGA     9660     - GACCTTGGAG GGAGAGGTAA TAAAAGGAGG CAAAGATGAT TTTCCATGCT TA - #CAACTCAC     9720     - AGCTGAGGCC TAACTATCTT TATGTCCATA AGAGGCATCC TTGTGTCGAA CC - #TCTCCTCT     9780     - TTCTTGGGTC AATGGGGGAT GGTTGCAAGG GACCATCAGT AGGAAGGCAT AG - #TACACTAA     9840     - CCCAGTCTGG GGTGGGCTTT TAGACTAGTC TTCCTCCCAT GCTCCTCCTC CC - #ATTGGAAC     9900     - CCCGGACTTT CAAGACTGCT ACCTAGCACA CCAGTGCACC AGATGTCACT CA - #AAACCTCT     9960     - TCAGCAATGG CCCACTCACC TTCAAAAAGG CTGAAGAGCA GACTGGCTGG GT - #TCTTCATG     10020     - GTGGAGGGGC AGTCTGGGAG GTTTTAAGGT TGAAGATGAA AACTTTCACT TT - #TGGCTCAA     10080     - TGGTCTGAAA AAGAGAAGGA CCAGCAAGTG AACTGAAGCC TCCTGGAAAG CA - #TCTTGATA     10140     - ACAGGGGCAG AGTTTCAAGA TGAGAAGCTG TGGCACTTAC TCTGGCTTTG GA - #AATGACCT     10200     - CTAAGTATCT CAGTTAATTA AAGGAGTCAA ACTCTAGACT CGAAGGAGAA GA - #TCTACAAT     10260     - TTTCAATAAC ATAGTCTACC CTCCCCTCCT TCCCCCACCT TCACCTCTTC TT - #TCATCACA     10320     - GGCTTACAGG GCACCTCTTA GAGCCAGGCA CGGTGTTGGG ATCAGGAACA AG - #GCCACTGC     10380     - TCACATCCAG AGCCTGTGCT ACTTAAGAAG CTTCCAGGAC CTCTTGGATG GC - #TGTGGTTA     10440     - GTGCCCTACT TTTCCCAGCA GGTTGGATGC AGAATCATGC TCTTGTCGTT CA - #GGATGACC     10500     - ATGGGGACCA TGGGTCTGAG CCTGTGACCC TCCAGTCTAC AGTGTGTTGG TG - #AGGAAGGA     10560     - GCAGTTGTCA CTGGGGTCAC TGGCAATGGG CATGCCTCCA TCTAGCTTAG GC - #AAGATGCT     10620     - TAGACTCAGA GCCAGAGAGT GAAACCCAGA CACTAATGAG CTGTCGGTGT TG - #GTGTGTGT     10680     - TCTCTTCCTC TTCCAGTGGA ACATGACAAG GAATTCTTCC ACCCACGCTA CC - #ACCATCGA     10740     - GAGTTCCGGT TTGATCTTTC CAAGATCCCA GAAGGGGAAG CTGTCACGGC AG - #CCGAATTC     10800     - CGGATCTACA AGGACTACAT CCGGGAACGC TTCGACAATG AGACGTTCCG GA - #TCAGCGTT     10860     - TATCAGGTGC TCCAGGAGCA CTTGGGCAGG TGGGTGCTAT ACGGGTATCT GG - #GAGAGGTG     10920     - CTGAGTTTCC TCTGGGGGCA GAGGAAGAAG GTGGTGAGGG TTTCCCTCCC CT - #CCCACCCC     10980     - ATGAGCTCTG CTTCCCATCT GTTGGGGTAG TGGAGCTGTG ACCTGCTAAC GC - #GAAGCCCG     11040     - TGTCTCTCCT CCTCTCTCGC AGGGAATCGG ATCTCTTCCT GCTCGACAGC CG - #TACCTCTG     11100     - GGCCTCGGAG GAGGGCTGGC TGGTGTTTGA CATCACAGCC ACCAGCAACC AC - #TGGGTGGT     11160     - CAATCCGCGG CACAACCTGG GCCTGCAGCT CTCGGTGGAG ACGCTGGATG GT - #GAGTCCCC     11220     - CGCCACTGCC AGTCCTAATG CAGCCTGTGC TCCTGGACTT CAGGAGGGTC TC - #AGCAGTGC     11280     - TCATGCTTGC TTCACTACAA ACAGGCTTCC CCGCCCCTCC CAACCAGTAC TC - #CATGTTCA     11340     - GCCTTTTGAT CCTGCAGCCC TGTCCCGCTC GTGGCCCTCC TGTAACTGCT CT - #TCTGTGCA     11400     - CTTGGCTGCT TCCTGTCCAG GGCAGACGAT CAACCCCAAG TTGGCGGGCC TG - #ATTGGGCG     11460     - GCACGGGCCC CAGAACAAGC AGCCCTTCAT GGTGGCTTTC TTCAAGGCCA CG - #GAGGTCCA     11520     - CTTCCGCAGC ATCCGGTCCA CGGGGAGCAA ACAGCGCAGC CAGAACCGCT CC - #AAGACGCC     11580     - CAAGAACCAG GAAGCCCTCG GATGGCCAAC GTGGCAGGGT ATCTTAGGTG GG - #AGGGATCA     11640     - CAGACCCACC ACAGGAACCC AGCAGGCCCC GGCGACCGCA GGAGACTGAC TA - #AAATCATT     11700     - CAGTGCTCAC CAAGATGCTC TGAGCTCTCT TCGATTTTAG CAAACCAGGA GT - #CCGAAGAT     11760     - CTAAGGAGAG CTGGGGGTTT GACTCCGAGA GCTCGAGCAG TCCCCAAGAC CT - #GGTCTTGA     11820     - CTCACGAGTT AGACTCCACT CAGAGGCTGA CTGTCTCCAG GGTCTACACC TC - #TAAGGGCG     11880     - ACACTGGGCT CAAGCAGACT GCCGTTTTCT ATATGGGATG AGCCTTCACA GG - #GCAGCCAG     11940     - TTGGGATGGG TTGAGGTTTG GCTGTAGACA TCAGAAACCC AAGTCAAATG CG - #CTTCAACC     12000     - AGTAGAAAAT TCACCAGCCC GCAGAGCTAA GGTTGGGTGG ACATTAGGGT TG - #GTTGATCC     12060     - AGGAGCTCAA CAGTGTCCTC TGAGCCCCAG CTCCTTCTGC CCCACCCCAC CA - #TCTTCAGT     12120     - GCTGCTTCCT CTCAAGGCCA CAGCTGTAGT TGGCCAGGGG GGCTTCATTA TT - #TTTTGCTC     12180     - CTGGGCAGTA GGAGGAAGAG AATGAATGTC TCTCCATGGG TCTTTCTTAG GA - #ATGTGGGA     12240     - ACTTTTTCCA GAAGTCTCTA TGTCTTTTAG TTTGTGTTGG GTCACTTGCC CT - #TCCTGAAC     12300     - CACTTCCTGA CTCCTGGACA GGATGTGCAC TGATGAGCTT AGCTTTGGGG AT - #CTAATAGT     12360     - GACTTTACAA AGCCTCTTTG AGAAGGTGAC ATTGGAACCA AGGCTTGAGC AG - #ACACAACA     12420     - AAGATTGCAG GGAGGGGCAT TGCAGGTGGA GGAAACGGCA CATGCAAGAG CC - #CTGCGTGG     12480     - GAGTGAGCTT GGTGTTTGGT CAATCAGTTG TCAGAGCACA CCGGGCCCTG TC - #AGCAGGCA     12540     - CAGCCTGGGC CTGCTCTGAG TATGACAGAG AGCCCCTGGG AAGTTGTAGG TG - #GAGGAAAG     12600     - ACAGGTCATG ACTAGGAAAA AAGCAATCCC TCTGTTGTGG GGTGGAAGGA AG - #GTTGCAGT     12660     - GTGTGTGAGA GAGAGACAAG ACAGACAGAC AGACACTTCT CAATGTTTAC AA - #GTGCTCAG     12720     - GCCCTGACCC GAATGCTTCC AAATTTACGT AGTTCTGGAA AACCCCCTGT AT - #CATTTTCA     12780     - CTACTCAAAG AAACCTCGGG AGTGTTTTCT TCTGAAAGGT CATCAGGTTT TG - #ACTCTCTG     12840     - CTGTCTCATT TCTTCTTGCT GGTGGTGGTG ATGGTTGCTT GTCCCAGGCC CT - #GTCCCGCA     12900     - TCCTCTTGCC CCTGCAGAGG GATGAGTGTG TTGGGGCCTC ACGAGTTGAG GT - #TGTTCATA     12960     - AGCAGATCTC TTTGAGCAGG GCGCCTGCAG TGGCCTTGTG TGAGGCTGGA GG - #GGTTTCGA     13020     - TTCCCTTATG GAATCCAGGC AGATGTAGCA TTTAAACAAC ACACGTGTAT AA - #AAGAAACC     13080     - AGTGTCCGCA GAAGGTTCCA GAAAGTATTA TGGGATAAGA CTACATGAGA GA - #GGAATGGG     13140     - GCATTGGCAC CTCCCTTAGT AGGGCCTTTG CTGGGGGTAG AAATGAGTTT TA - #AGGCAGGT     13200     - TAGACCCTCG AACTGGCTTT TGAATCGGGA AATTTACCCC CCAGCCGTTC TG - #TGCTTCAT     13260     - TGCTGTTCAC ATCACTGCCT AAGATGGAGG AACTTTGATG TGTGTGTGTT TC - #TTTCTCCT     13320     - CACTGGGCTC TGCTTCTTCA CTTCCTTGTC AATGCAGAGA ACAGCAGCAG GC - #ACCAGAGG     13380     - CAGGCCTTGT AAGAAGCACG AGCTGTATGT CAGCTTCCGA GACCTGGGCT GG - #CAGGTAAG     13440     - GGGCTGGCTG GGTCTGTCTT GGGTGTGGGC CCTCTGGCGT GGGCTCCCAC AG - #GCAGCGGG     13500     - TGCTGTGCTC AGTCTTGTTT CTCATCTCTG CCAGTTAAGA CTCCAGTATC AA - #GTGGCCTC     13560     - GCTAGGGAAG GGGACTTGGG CTAAGGATAC AGGGAGGCCT CATGAAATCC GA - #GAGCAGAA     13620     - ATGTGGTTGA GACTTGAACT CGAACCAGGA ACCCAAACAC TTTGGACTCT GA - #ACCCCATT     13680     - CTCTGCATGC ACCTCATTCC CATCCCTTGG CTGGCTGCTT CTCAAGATGA TG - #CCGGGCCG     13740     - TGTGTTTGAA TGTAGATACC TGGGGAGCCA TCTCCCCCTC TGCCCTCTGA CT - #TCATTTAC     13800     - CCCATTCCCA TTCCCACGGG AGGGACGGAT CTCCCCAGCT TGGTTCAGGC GC - #TTGTTCCT     13860     - GAACCAGTCA ACTGTTTCAG GGGTGGGGTC ATGTTACTGG CACATGGCTG CC - #CCCTCTGG     13920     - AGCCATTTGC ATGGAGTGAG GCAAAAGGCA GGGGATGAAT CTAGGAGAGG AG - #TGAGGGTC     13980     - ATGTGATCCA CCTGCCGTGA GCTCTGGATC GTGATTCTCA TTCAGCAGTC AC - #GAGCATCT     14040     - CGAGCGTTCT GGGCCCTGTT CTAGGTACTG GATTGGAGAT GCAGCGATGA AC - #ACTGCAAT     14100     - GTGTCTGCCC TGTGGGGCTC AAATATCCCT GGAGAGGGTA TTGTCATGAG GT - #CATCAGGG     14160     - CAACTGGTGG TATTCTACCC TCAGGGAGCT TGTAGTTCAG TGGGAGAGTC CA - #GAATCTTC     14220     - CCTGGGGATT ATGCCCAGAC ACACTCAGGG CGTACGTGCA CACAGCCAGC TC - #TGAGCCCT     14280     - CCTGTGAGCC TGCCCTCAGG ACTGATGACC ACATCTACCT GCAGCTGGGA CA - #GAACCCAA     14340     - ACTCCAGGGG CCTCTGCTGG AAGATTCCAT GTGCTTAAGC ATCACTGAGG AG - #TATATTGA     14400     - TTATTGGGCA ACATTTCTGT GCCACCCAGA CCCTAGAGGC AAGGATGGCA CA - #TGGATCCC     14460     - TTACTGACCA GTGCACCCGG AGCCAGCATG GGTGATGCCA TTATGAGTTA TT - #AGCCTCTC     14520     - TGGCAGGTGG GCAAACCGAG GCATGGAGGT TTGTTTAAGG TGAACTGCCA GT - #GTGTGACC     14580     - ACCTAGTGGG GGTAGAGCTG ATGATTGCCT CACACCGGAG GCTCCTTCCT GT - #GCCGCGTT     14640     - CTGTCCAGAA GACACAGCCA TGGATGTCCA TTTTAGGATC AGCCAAGCCC GT - #GGGGCTTT     14700     - CCTTCATTTT TATTTTATGT TTTTTTAGAA ATGGGGTCTT GCTCTGTCAC CC - #AGGCTGGG     14760     - GTGCAGTGGT GTGATCATAC GTCACCGCAG CTTTGAGCCG TCTTCCCACT CA - #GTCTACTA     14820     - AGCTTGGACT ATAGGCCAAG ACTATAGAGT GGTCCTTCTT TCCATTCTTT TG - #GGACCATG     14880     - AGAGGCCACC CATGTTTCCT GCCCCTGCTG GGCCCTGCTG CTCAGAAGGC AT - #GGTCTGAG     14940     - GCTTTCACCT TGGTCGTGAG CCTTCGTGGT GGTTTCTTTC AGCATGGGGT TG - #GGATGCTG     15000     - TGCTCAGGCT TCTGCATGGT TTCCCACACT CTCTTCTCCT CCTCAGGACT GG - #ATCATCGC     15060     - GCCTGAAGGC TACGCGCGCT ACTACTGTGA GGGGGAGTGT GCCTTCCCTC TG - #AACTCCTA     15120     - CATGAACGCC ACCAACCACG CCATCGTGCA GACGCTGGTG GGTGTCACGC CA - #TCTTGGGG     15180     - TGTGGTCACC TGGGCCGGGC AGGCTGCGGG GCCACCAGAT CCTGCTGCCT CC - #AAGCTGGG     15240     - GCCTGAGTAG ATGTCAGCCC ATTGCCATGT CATGACTTTT GGGGGCCCCT TG - #CGCCGTTA     15300     - AAAAAAAATC AAAAATTGTA CTTTATGACT GGTTTGGTAT AAAGAGGAGT AT - #AATCTTCG     15360     - ACCCTGGAGT TCATTTATTT CTCCTAATTT TTAAAGTAAC TAAAAGTTGT AT - #GGGCTCCT     15420     - TTGAGGATGC TTGTAGTATT GTGGGTGCTG GTTACGGTGC CTAAGAGCAC TG - #GGCCCCTG     15480     - CTTCATTTTC CAGTAGAGGA AACAGGTAAA CAGATGAGAA ATTTCAGTGA GG - #GGCACAGT     15540     - GATCAGAAGC GGGCCAGCAG GATAATGGGA TGGAGAGATG AGTGGGGACC CA - #TGGGCCAT     15600     - TTCAAGTTAA ATTTCAGTCG GGTCACCAGG AAGATTCCAT GTGATAATGA GA - #TTAACGTG     15660     - CCCAGTCACG GCGACACTCA GTAGGTGTTA TTCCTGCTCT GCCAACAGCA AC - #CATAGTTG     15720     - ATAAGAGCTG TTAGGGATTT TGTCCTTTTG CTTAGAATCC AAGGTTCAAG GA - #CCTTGGTT     15780     - ATGTAGCTCC CTGTCATGAA CATCATCTGA GCCTTTCCTG CCTACTGATC AT - #CCACCCTG     15840     - CCTTGAATGC TTCTAGTGAC AGAGAGCTCA CTACCAGGAC TACTCCCTCC TT - #TCATTTAG     15900     - TAATCTGCCT CCTTCTTTTC TTGTCCCTGT CCTGTGTGTT AAGTCCTGGA GA - #AAAATCTC     15960     - ATCTATCCCT TTCATTTGAT TCTGCTCTTT GAGGGCAGGG GTTTTTGTTT CT - #TTGTTTGT     16020     - TTTTTTAAGT GTTGGTTTTC CAAAGCCCTT GCTCCCCTCC TCAATTGAAA CT - #TCAAAGCC     16080     - CTCATTGGGA TTGAAGGTCC TTAGGCTGGA AACAGAAGAG TCCTCCCCAA CC - #TGTTCCCT     16140     - GGCCTGGATG TGCTGTGCTG TGCCAGTATC CCCTGGAAGG TGCCAGGCAT GT - #CTCCCCGG     16200     - CTGCCAGGGG ACACATCTCT ATCCTTCTCC AACCCCTGCC TTCATGGCCC AT - #GGAACAGG     16260     - AGTGCCATCG CCCTGTGTGC ACCTACTTCC ATCAGTATTT CACCAGAGAT CT - #GCAGGATC     16320     - AAAGTGAATT CTCCAGGGAT TGTGAAATGA TGCGATTGTG GTCATGTTTA AA - #AGGGGGCA     16380     - ACTGTCTTCT AGAGAGTCCT GATGAAATGC TTCCAGAGGA AATGAGCTGA TG - #GCTGGAAT     16440     - TTGCTTTAAA ATCATTCAAG GTGGAGCAGG TGGGGAAGGG TATGGATGTG TA - #AGAGTTTG     16500     - AAATTGTCCA TCATAAAATG TGTAAAAAGC ATGCTGGCCT ATGTCAGCAG TC - #ACAGCCTG     16560     - GAGGTGGTAA CAGAGTGCCA GTCACTGATG CTCAAGCCTG GCACCTACAG TT - #GCTGGAAA     16620     - CCCAGAAGTT TCACGTTGAA AACAACAGGA CAGTGGAATC TCTGGCCCTG TC - #TTGAACAC     16680     - GTGGCAGATC TGCTAACACT GATCTTGGTT GGCTGCCGTC AGCTTAGGTT GA - #GTGGCGGT     16740     - CTTCCCTTAG TTTGCTTAGT CCCCGCTATT CCCTATTGTC TTACCTCGGT CT - #ATTTTGCT     16800     - TATCAGTGGA CCTCACGAGG CACTCATAGG CATTTGAGTC TATGTGTCCC TG - #TCCCACAT     16860     - CCTCTGTAAG GTGCAGAGAA GTCCATGAGC AAGATGGAGC ACTTCTAGTG GG - #TCCAAGTC     16920     - AGGGACACTA TTCAGCAATC TACAGTGCAC AGGGCAGTTC CCCAACAGAG AA - #TTACCTGG     16980     - TCCTGAATGT CGGATCTGGC CCCTTCCTTC CCCACTGTAT AATGTGAAAA CC - #TCTATGCT     17040     - TTGTTCCCCT TGTCTGCAAA ACAGGGATAA TCCCAGAACT GAGTTGTCCA TG - #TAAAGTGC     17100     - TTAGAACAGG GAGTGCTTGG CTTGGGGAGT GTCACCTGCA GTCATTCATT AT - #GCCCAGAC     17160     - AGGATGTTTC TTTATAGAAA CGTGGAGGCC AGTTAGAACG ACTCACCGCT TC - #TCACCACT     17220     - GCCCATGTTT TGGTGTGTGT TTCAGGTCCA CTTCATCAAC CCGGAAACGG TG - #CCCAAGCC     17280     - CTGCTGTGCG CCCACGCAGC TCAATGCCAT CTCCGTCCTC TACTTCGATG AC - #AGCTCCAA     17340     - CGTCATCCTG AAGAAATACA GAAACATGGT GGTCCGGGCC TGTGGCTGCC AC - #TAGCTCCT     17400     #     17410     - (2) INFORMATION FOR SEQ ID NO:4:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1260 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: NO     -     (iv) ANTI-SENSE: NO     -     (vi) ORIGINAL SOURCE:               (A) ORGANISM: HOMO SAPI - #ENS     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 9..1196     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "CBMP2A"     #"CBMP2A (CDNA)"/note=     -      (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #4:     #GCG TTG CTG CTT CCC      50CC CGC TGT CTT CTA              Met Val Ala Gly Thr A - #rg Cys Leu Leu Ala Leu Leu Leu Pro     #        10     - CAG GTC CTC CTG GGC GGC GCG GCT GGC CTC GT - #T CCG GAG CTG GGC CGC       98     Gln Val Leu Leu Gly Gly Ala Ala Gly Leu Va - #l Pro Glu Leu Gly Arg     # 30     - AGG AAG TTC GCG GCG GCG TCG TCG GGC CGC CC - #C TCA TCC CAG CCC TCT      146     Arg Lys Phe Ala Ala Ala Ser Ser Gly Arg Pr - #o Ser Ser Gln Pro Ser     #                 45     - GAC GAG GTC CTG AGC GAG TTC GAG TTG CGG CT - #G CTC AGC ATG TTC GGC      194     Asp Glu Val Leu Ser Glu Phe Glu Leu Arg Le - #u Leu Ser Met Phe Gly     #             60     - CTG AAA CAG AGA CCC ACC CCC AGC AGG GAC GC - #C GTG GTG CCC CCC TAC      242     Leu Lys Gln Arg Pro Thr Pro Ser Arg Asp Al - #a Val Val Pro Pro Tyr     #         75     - ATG CTA GAC CTG TAT CGC AGG CAC TCG GGT CA - #G CCG GGC TCA CCC GCC      290     Met Leu Asp Leu Tyr Arg Arg His Ser Gly Gl - #n Pro Gly Ser Pro Ala     #     90     - CCA GAC CAC CGG TTG GAG AGG GCA GCC AGC CG - #A GCC AAC ACT GTG CGC      338     Pro Asp His Arg Leu Glu Arg Ala Ala Ser Ar - #g Ala Asn Thr Val Arg     #110     - AGC TTC CAC CAT GAA GAA TCT TTG GAA GAA CT - #A CCA GAA ACG AGT GGG      386     Ser Phe His His Glu Glu Ser Leu Glu Glu Le - #u Pro Glu Thr Ser Gly     #               125     - AAA ACA ACC CGG AGA TTC TTC TTT AAT TTA AG - #T TCT ATC CCC ACG GAG      434     Lys Thr Thr Arg Arg Phe Phe Phe Asn Leu Se - #r Ser Ile Pro Thr Glu     #           140     - GAG TTT ATC ACC TCA GCA GAG CTT CAG GTT TT - #C CGA GAA CAG ATG CAA      482     Glu Phe Ile Thr Ser Ala Glu Leu Gln Val Ph - #e Arg Glu Gln Met Gln     #       155     - GAT GCT TTA GGA AAC AAT AGC AGT TTC CAT CA - #C CGA ATT AAT ATT TAT      530     Asp Ala Leu Gly Asn Asn Ser Ser Phe His Hi - #s Arg Ile Asn Ile Tyr     #   170     - GAA ATC ATA AAA CCT GCA ACA GCC AAC TCG AA - #A TTC CCC GTG ACC AGT      578     Glu Ile Ile Lys Pro Ala Thr Ala Asn Ser Ly - #s Phe Pro Val Thr Ser     175                 1 - #80                 1 - #85                 1 -     #90     - CTT TTG GAC ACC AGG TTG GTG AAT CAG AAT GC - #A AGC AGG TGG GAA AGT      626     Leu Leu Asp Thr Arg Leu Val Asn Gln Asn Al - #a Ser Arg Trp Glu Ser     #               205     - TTT GAT GTC ACC CCC GCT GTG ATG CGG TGG AC - #T GCA CAG GGA CAC GCC      674     Phe Asp Val Thr Pro Ala Val Met Arg Trp Th - #r Ala Gln Gly His Ala     #           220     - AAC CAT GGA TTC GTG GTG GAA GTG GCC CAC TT - #G GAG GAG AAA CAA GGT      722     Asn His Gly Phe Val Val Glu Val Ala His Le - #u Glu Glu Lys Gln Gly     #       235     - GTC TCC AAG AGA CAT GTT AGG ATA AGC AGG TC - #T TTG CAC CAA GAT GAA      770     Val Ser Lys Arg His Val Arg Ile Ser Arg Se - #r Leu His Gln Asp Glu     #   250     - CAC AGC TGG TCA CAG ATA AGG CCA TTG CTA GT - #A ACT TTT GGC CAT GAT      818     His Ser Trp Ser Gln Ile Arg Pro Leu Leu Va - #l Thr Phe Gly His Asp     255                 2 - #60                 2 - #65                 2 -     #70     - GGA AAA GGG CAT CCT CTC CAC AAA AGA GAA AA - #A CGT CAA GCC AAA CAC      866     Gly Lys Gly His Pro Leu His Lys Arg Glu Ly - #s Arg Gln Ala Lys His     #               285     - AAA CAG CGG AAA CGC CTT AAG TCC AGC TGT AA - #G AGA CAC CCT TTG TAC      914     Lys Gln Arg Lys Arg Leu Lys Ser Ser Cys Ly - #s Arg His Pro Leu Tyr     #           300     - GTG GAC TTC AGT GAC GTG GGG TGG AAT GAC TG - #G ATT GTG GCT CCC CCG      962     Val Asp Phe Ser Asp Val Gly Trp Asn Asp Tr - #p Ile Val Ala Pro Pro     #       315     - GGG TAT CAC GCC TTT TAC TGC CAC GGA GAA TG - #C CCT TTT CCT CTG GCT     1010     Gly Tyr His Ala Phe Tyr Cys His Gly Glu Cy - #s Pro Phe Pro Leu Ala     #   330     - GAT CAT CTG AAC TCC ACT AAT CAT GCC ATT GT - #T CAG ACG TTG GTC AAC     1058     Asp His Leu Asn Ser Thr Asn His Ala Ile Va - #l Gln Thr Leu Val Asn     335                 3 - #40                 3 - #45                 3 -     #50     - TCT GTT AAC TCT AAG ATT CCT AAG GCA TGC TG - #T GTC CCG ACA GAA CTC     1106     Ser Val Asn Ser Lys Ile Pro Lys Ala Cys Cy - #s Val Pro Thr Glu Leu     #               365     - AGT GCT ATC TCG ATG CTG TAC CTT GAC GAG AA - #T GAA AAG GTT GTA TTA     1154     Ser Ala Ile Ser Met Leu Tyr Leu Asp Glu As - #n Glu Lys Val Val Leu     #           380     - AAG AAC TAT CAG GAT ATG GTT GTG GAG GGT TG - #T GGG TGT CGC     #1196     Lys Asn Tyr Gln Asp Met Val Val Glu Gly Cy - #s Gly Cys Arg     #       395     - TAGTACAGCA AAATTAAATA CATAAATATA TATATATATA TATATTTTAG AA - #AAAAGAAA     1256     #           1260     - (2) INFORMATION FOR SEQ ID NO:5:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 396 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:5:     - Met Val Ala Gly Thr Arg Cys Leu Leu Ala Le - #u Leu Leu Pro Gln Val     #                 15     - Leu Leu Gly Gly Ala Ala Gly Leu Val Pro Gl - #u Leu Gly Arg Arg Lys     #             30     - Phe Ala Ala Ala Ser Ser Gly Arg Pro Ser Se - #r Gln Pro Ser Asp Glu     #         45     - Val Leu Ser Glu Phe Glu Leu Arg Leu Leu Se - #r Met Phe Gly Leu Lys     #     60     - Gln Arg Pro Thr Pro Ser Arg Asp Ala Val Va - #l Pro Pro Tyr Met Leu     # 80     - Asp Leu Tyr Arg Arg His Ser Gly Gln Pro Gl - #y Ser Pro Ala Pro Asp     #                 95     - His Arg Leu Glu Arg Ala Ala Ser Arg Ala As - #n Thr Val Arg Ser Phe     #           110     - His His Glu Glu Ser Leu Glu Glu Leu Pro Gl - #u Thr Ser Gly Lys Thr     #       125     - Thr Arg Arg Phe Phe Phe Asn Leu Ser Ser Il - #e Pro Thr Glu Glu Phe     #   140     - Ile Thr Ser Ala Glu Leu Gln Val Phe Arg Gl - #u Gln Met Gln Asp Ala     145                 1 - #50                 1 - #55                 1 -     #60     - Leu Gly Asn Asn Ser Ser Phe His His Arg Il - #e Asn Ile Tyr Glu Ile     #               175     - Ile Lys Pro Ala Thr Ala Asn Ser Lys Phe Pr - #o Val Thr Ser Leu Leu     #           190     - Asp Thr Arg Leu Val Asn Gln Asn Ala Ser Ar - #g Trp Glu Ser Phe Asp     #       205     - Val Thr Pro Ala Val Met Arg Trp Thr Ala Gl - #n Gly His Ala Asn His     #   220     - Gly Phe Val Val Glu Val Ala His Leu Glu Gl - #u Lys Gln Gly Val Ser     225                 2 - #30                 2 - #35                 2 -     #40     - Lys Arg His Val Arg Ile Ser Arg Ser Leu Hi - #s Gln Asp Glu His Ser     #               255     - Trp Ser Gln Ile Arg Pro Leu Leu Val Thr Ph - #e Gly His Asp Gly Lys     #           270     - Gly His Pro Leu His Lys Arg Glu Lys Arg Gl - #n Ala Lys His Lys Gln     #       285     - Arg Lys Arg Leu Lys Ser Ser Cys Lys Arg Hi - #s Pro Leu Tyr Val Asp     #   300     - Phe Ser Asp Val Gly Trp Asn Asp Trp Ile Va - #l Ala Pro Pro Gly Tyr     305                 3 - #10                 3 - #15                 3 -     #20     - His Ala Phe Tyr Cys His Gly Glu Cys Pro Ph - #e Pro Leu Ala Asp His     #               335     - Leu Asn Ser Thr Asn His Ala Ile Val Gln Th - #r Leu Val Asn Ser Val     #           350     - Asn Ser Lys Ile Pro Lys Ala Cys Cys Val Pr - #o Thr Glu Leu Ser Ala     #       365     - Ile Ser Met Leu Tyr Leu Asp Glu Asn Glu Ly - #s Val Val Leu Lys Asn     #   380     - Tyr Gln Asp Met Val Val Glu Gly Cys Gly Cy - #s Arg     385                 3 - #90                 3 - #95     - (2) INFORMATION FOR SEQ ID NO:6:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1788 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: NO     -     (iv) ANTI-SENSE: NO     -     (vi) ORIGINAL SOURCE:               (A) ORGANISM: HOMO SAPI - #ENS               (F) TISSUE TYPE: HIPPOC - #AMPUS     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 403..1626               (C) IDENTIFICATION METHOD: - # experimental     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "CBMP2B"     #               /evidence=- # EXPERIMENTAL     #"CBMP2B (CDNA)"/note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:6:     - GAATTCGGGG CAGAGGAGGA GGGAGGGAGG GAAGGAGCGC GGAGCCCGGC CC - #GGAAGCTA       60     - GGTGAGTGTG GCATCCGAGC TGAGGGACGC GAGCCTGAGA CGCCGCTGCT GC - #TCCGGCTG      120     - AGTATCTAGC TTGTCTCCCC GATGGGATTC CCGTCCAAGC TATCTCGAGC CT - #GCAGCGCC      180     - ACAGTCCCCG GCCCTCGCCC AGGTTCACTG CAACCGTTCA GAGGTCCCCA GG - #AGCTGCTG      240     - CTGGCGAGCC CGCTACTGCA GGGACCTATG GAGCCATTCC GTAGTGCCAT CC - #CGAGCAAC      300     - GCACTGCTGC AGCTTCCCTG AGCCTTTCCA GCAAGTTTGT TCAAGATTGG CT - #GTCAAGAA      360     - TCATGGACTG TTATTATATG CCTTGTTTTC TGTCAAGACA CC ATG ATT - # CCT GGT      414     #           Met Ile Pro Gly     #             1     - AAC CGA ATG CTG ATG GTC GTT TTA TTA TGC CA - #A GTC CTG CTA GGA GGC      462     Asn Arg Met Leu Met Val Val Leu Leu Cys Gl - #n Val Leu Leu Gly Gly     #  20     - GCG AGC CAT GCT AGT TTG ATA CCT GAG ACG GG - #G AAG AAA AAA GTC GCC      510     Ala Ser His Ala Ser Leu Ile Pro Glu Thr Gl - #y Lys Lys Lys Val Ala     #                 35     - GAG ATT CAG GGC CAC GCG GGA GGA CGC CGC TC - #A GGG CAG AGC CAT GAG      558     Glu Ile Gln Gly His Ala Gly Gly Arg Arg Se - #r Gly Gln Ser His Glu     #             50     - CTC CTG CGG GAC TTC GAG GCG ACA CTT CTG CA - #G ATG TTT GGG CTG CGC      606     Leu Leu Arg Asp Phe Glu Ala Thr Leu Leu Gl - #n Met Phe Gly Leu Arg     #         65     - CGC CGC CCG CAG CCT AGC AAG AGT GCC GTC AT - #T CCG GAC TAC ATG CGG      654     Arg Arg Pro Gln Pro Ser Lys Ser Ala Val Il - #e Pro Asp Tyr Met Arg     #     80     - GAT CTT TAC CGG CTT CAG TCT GGG GAG GAG GA - #G GAA GAG CAG ATC CAC      702     Asp Leu Tyr Arg Leu Gln Ser Gly Glu Glu Gl - #u Glu Glu Gln Ile His     #100     - AGC ACT GGT CTT GAG TAT CCT GAG CGC CCG GC - #C AGC CGG GCC AAC ACC      750     Ser Thr Gly Leu Glu Tyr Pro Glu Arg Pro Al - #a Ser Arg Ala Asn Thr     #               115     - GTG AGG AGC TTC CAC CAC GAA GAA CAT CTG GA - #G AAC ATC CCA GGG ACC      798     Val Arg Ser Phe His His Glu Glu His Leu Gl - #u Asn Ile Pro Gly Thr     #           130     - AGT GAA AAC TCT GCT TTT CGT TTC CTC TTT AA - #C CTC AGC AGC ATC CCT      846     Ser Glu Asn Ser Ala Phe Arg Phe Leu Phe As - #n Leu Ser Ser Ile Pro     #       145     - GAG AAC GAG GTG ATC TCC TCT GCA GAG CTT CG - #G CTC TTC CGG GAG CAG      894     Glu Asn Glu Val Ile Ser Ser Ala Glu Leu Ar - #g Leu Phe Arg Glu Gln     #   160     - GTG GAC CAG GGC CCT GAT TGG GAA AGG GGC TT - #C CAC CGT ATA AAC ATT      942     Val Asp Gln Gly Pro Asp Trp Glu Arg Gly Ph - #e His Arg Ile Asn Ile     165                 1 - #70                 1 - #75                 1 -     #80     - TAT GAG GTT ATG AAG CCC CCA GCA GAA GTG GT - #G CCT GGG CAC CTC ATC      990     Tyr Glu Val Met Lys Pro Pro Ala Glu Val Va - #l Pro Gly His Leu Ile     #               195     - ACA CGA CTA CTG GAC ACG AGA CTG GTC CAC CA - #C AAT GTG ACA CGG TGG     1038     Thr Arg Leu Leu Asp Thr Arg Leu Val His Hi - #s Asn Val Thr Arg Trp     #           210     - GAA ACT TTT GAT GTG AGC CCT GCG GTC CTT CG - #C TGG ACC CGG GAG AAG     1086     Glu Thr Phe Asp Val Ser Pro Ala Val Leu Ar - #g Trp Thr Arg Glu Lys     #       225     - CAG CCA AAC TAT GGG CTA GCC ATT GAG GTG AC - #T CAC CTC CAT CAG ACT     1134     Gln Pro Asn Tyr Gly Leu Ala Ile Glu Val Th - #r His Leu His Gln Thr     #   240     - CGG ACC CAC CAG GGC CAG CAT GTC AGG ATT AG - #C CGA TCG TTA CCT CAA     1182     Arg Thr His Gln Gly Gln His Val Arg Ile Se - #r Arg Ser Leu Pro Gln     245                 2 - #50                 2 - #55                 2 -     #60     - GGG AGT GGG AAT TGG GCC CAG CTC CGG CCC CT - #C CTG GTC ACC TTT GGC     1230     Gly Ser Gly Asn Trp Ala Gln Leu Arg Pro Le - #u Leu Val Thr Phe Gly     #               275     - CAT GAT GGC CGG GGC CAT GCC TTG ACC CGA CG - #C CGG AGG GCC AAG CGT     1278     His Asp Gly Arg Gly His Ala Leu Thr Arg Ar - #g Arg Arg Ala Lys Arg     #           290     - AGC CCT AAG CAT CAC TCA CAG CGG GCC AGG AA - #G AAG AAT AAG AAC TGC     1326     Ser Pro Lys His His Ser Gln Arg Ala Arg Ly - #s Lys Asn Lys Asn Cys     #       305     - CGG CGC CAC TCG CTC TAT GTG GAC TTC AGC GA - #T GTG GGC TGG AAT GAC     1374     Arg Arg His Ser Leu Tyr Val Asp Phe Ser As - #p Val Gly Trp Asn Asp     #   320     - TGG ATT GTG GCC CCA CCA GGC TAC CAG GCC TT - #C TAC TGC CAT GGG GAC     1422     Trp Ile Val Ala Pro Pro Gly Tyr Gln Ala Ph - #e Tyr Cys His Gly Asp     325                 3 - #30                 3 - #35                 3 -     #40     - TGC CCC TTT CCA CTG GCT GAC CAC CTC AAC TC - #A ACC AAC CAT GCC ATT     1470     Cys Pro Phe Pro Leu Ala Asp His Leu Asn Se - #r Thr Asn His Ala Ile     #               355     - GTG CAG ACC CTG GTC AAT TCT GTC AAT TCC AG - #T ATC CCC AAA GCC TGT     1518     Val Gln Thr Leu Val Asn Ser Val Asn Ser Se - #r Ile Pro Lys Ala Cys     #           370     - TGT GTG CCC ACT GAA CTG AGT GCC ATC TCC AT - #G CTG TAC CTG GAT GAG     1566     Cys Val Pro Thr Glu Leu Ser Ala Ile Ser Me - #t Leu Tyr Leu Asp Glu     #       385     - TAT GAT AAG GTG GTA CTG AAA AAT TAT CAG GA - #G ATG GTA GTA GAG GGA     1614     Tyr Asp Lys Val Val Leu Lys Asn Tyr Gln Gl - #u Met Val Val Glu Gly     #   400     - TGT GGG TGC CGC TGAGATCAGG CAGTCCTTGA GGATAGACAG AT - #ATACACAC     1666     Cys Gly Cys Arg     405     - ACACACACAC ACACCACATA CACCACACAC ACACGTTCCC ATCCACTCAC CC - #ACACACTA     1726     - CACAGACTGC TTCCTTATAG CTGGACTTTT ATTTAAAAAA AAAAAAAAAA AA - #ACCCGAAT     1786     #            1788     - (2) INFORMATION FOR SEQ ID NO:7:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 408 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:7:     - Met Ile Pro Gly Asn Arg Met Leu Met Val Va - #l Leu Leu Cys Gln Val     #                 15     - Leu Leu Gly Gly Ala Ser His Ala Ser Leu Il - #e Pro Glu Thr Gly Lys     #             30     - Lys Lys Val Ala Glu Ile Gln Gly His Ala Gl - #y Gly Arg Arg Ser Gly     #         45     - Gln Ser His Glu Leu Leu Arg Asp Phe Glu Al - #a Thr Leu Leu Gln Met     #     60     - Phe Gly Leu Arg Arg Arg Pro Gln Pro Ser Ly - #s Ser Ala Val Ile Pro     # 80     - Asp Tyr Met Arg Asp Leu Tyr Arg Leu Gln Se - #r Gly Glu Glu Glu Glu     #                 95     - Glu Gln Ile His Ser Thr Gly Leu Glu Tyr Pr - #o Glu Arg Pro Ala Ser     #           110     - Arg Ala Asn Thr Val Arg Ser Phe His His Gl - #u Glu His Leu Glu Asn     #       125     - Ile Pro Gly Thr Ser Glu Asn Ser Ala Phe Ar - #g Phe Leu Phe Asn Leu     #   140     - Ser Ser Ile Pro Glu Asn Glu Val Ile Ser Se - #r Ala Glu Leu Arg Leu     145                 1 - #50                 1 - #55                 1 -     #60     - Phe Arg Glu Gln Val Asp Gln Gly Pro Asp Tr - #p Glu Arg Gly Phe His     #               175     - Arg Ile Asn Ile Tyr Glu Val Met Lys Pro Pr - #o Ala Glu Val Val Pro     #           190     - Gly His Leu Ile Thr Arg Leu Leu Asp Thr Ar - #g Leu Val His His Asn     #       205     - Val Thr Arg Trp Glu Thr Phe Asp Val Ser Pr - #o Ala Val Leu Arg Trp     #   220     - Thr Arg Glu Lys Gln Pro Asn Tyr Gly Leu Al - #a Ile Glu Val Thr His     225                 2 - #30                 2 - #35                 2 -     #40     - Leu His Gln Thr Arg Thr His Gln Gly Gln Hi - #s Val Arg Ile Ser Arg     #               255     - Ser Leu Pro Gln Gly Ser Gly Asn Trp Ala Gl - #n Leu Arg Pro Leu Leu     #           270     - Val Thr Phe Gly His Asp Gly Arg Gly His Al - #a Leu Thr Arg Arg Arg     #       285     - Arg Ala Lys Arg Ser Pro Lys His His Ser Gl - #n Arg Ala Arg Lys Lys     #   300     - Asn Lys Asn Cys Arg Arg His Ser Leu Tyr Va - #l Asp Phe Ser Asp Val     305                 3 - #10                 3 - #15                 3 -     #20     - Gly Trp Asn Asp Trp Ile Val Ala Pro Pro Gl - #y Tyr Gln Ala Phe Tyr     #               335     - Cys His Gly Asp Cys Pro Phe Pro Leu Ala As - #p His Leu Asn Ser Thr     #           350     - Asn His Ala Ile Val Gln Thr Leu Val Asn Se - #r Val Asn Ser Ser Ile     #       365     - Pro Lys Ala Cys Cys Val Pro Thr Glu Leu Se - #r Ala Ile Ser Met Leu     #   380     - Tyr Leu Asp Glu Tyr Asp Lys Val Val Leu Ly - #s Asn Tyr Gln Glu Met     385                 3 - #90                 3 - #95                 4 -     #00     - Val Val Glu Gly Cys Gly Cys Arg                     405     - (2) INFORMATION FOR SEQ ID NO:8:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 516 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: YES     -     (iv) ANTI-SENSE: NO     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 1..507     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "OP1A"     #"OP1A FUSION"  /note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:8:     - ATG AAA GCA ATT TTC GTA CTG AAA GGT TCA CT - #G GAC AGA GAT CTG GAC       48     Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - TCT CGT CTG GAT CTG GAC GTT CGT ACC GAC CA - #C AAA GAC CTG TCT GAT       96     Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - CAC CTG GTT CTG GTC GAC CTG GCT CGT AAC GA - #C CTG GCT CGT ATC GTT      144     His Leu Val Leu Val Asp Leu Ala Arg Asn As - #p Leu Ala Arg Ile Val     #         45     - ACT CCC GGG TCT CGT TAC GTT GCG GAT CTG GA - #A TTC GAT CCT CAC CAG      192     Thr Pro Gly Ser Arg Tyr Val Ala Asp Leu Gl - #u Phe Asp Pro His Gln     #     60     - AGG CAG GCC TGT AAG AAG CAC GAG CTG TAT GT - #C AGC TTC CGA GAC CTG      240     Arg Gln Ala Cys Lys Lys His Glu Leu Tyr Va - #l Ser Phe Arg Asp Leu     # 80     - GGC TGG CAG GAC TGG ATC ATC GCG CCT GAA GG - #C TAC GCG GCC TAC TAC      288     Gly Trp Gln Asp Trp Ile Ile Ala Pro Glu Gl - #y Tyr Ala Ala Tyr Tyr     #                 95     - TGT GAG GGG GAG TGT GCC TTC CCT CTG AAC TC - #C TAC ATG AAC GCC ACC      336     Cys Glu Gly Glu Cys Ala Phe Pro Leu Asn Se - #r Tyr Met Asn Ala Thr     #           110     - AAC CAC GCC ATC GTG CAG ACG CTG GTC CAC TT - #C ATC AAC CCG GAA ACG      384     Asn His Ala Ile Val Gln Thr Leu Val His Ph - #e Ile Asn Pro Glu Thr     #       125     - GTG CCC AAG CCC TGC TGT GCG CCC ACG CAG CT - #C AAT GCC ATC TCC GTC      432     Val Pro Lys Pro Cys Cys Ala Pro Thr Gln Le - #u Asn Ala Ile Ser Val     #   140     - CTC TAC TTC GAT GAC AGC TCC AAC GTC ATC CT - #G AAG AAA TAC AGA AAC      480     Leu Tyr Phe Asp Asp Ser Ser Asn Val Ile Le - #u Lys Lys Tyr Arg Asn     145                 1 - #50                 1 - #55                 1 -     #60     #      516GTC CGG GCC TGT GGC TGC CAC TAACTGCAG - #     Met Val Val Arg Ala Cys Gly Cys His                     165     - (2) INFORMATION FOR SEQ ID NO:9:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 169 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:9:     - Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - His Leu Val Leu Val Asp Leu Ala Arg Asn As - #p Leu Ala Arg Ile Val     #         45     - Thr Pro Gly Ser Arg Tyr Val Ala Asp Leu Gl - #u Phe Asp Pro His Gln     #     60     - Arg Gln Ala Cys Lys Lys His Glu Leu Tyr Va - #l Ser Phe Arg Asp Leu     # 80     - Gly Trp Gln Asp Trp Ile Ile Ala Pro Glu Gl - #y Tyr Ala Ala Tyr Tyr     #                 95     - Cys Glu Gly Glu Cys Ala Phe Pro Leu Asn Se - #r Tyr Met Asn Ala Thr     #           110     - Asn His Ala Ile Val Gln Thr Leu Val His Ph - #e Ile Asn Pro Glu Thr     #       125     - Val Pro Lys Pro Cys Cys Ala Pro Thr Gln Le - #u Asn Ala Ile Ser Val     #   140     - Leu Tyr Phe Asp Asp Ser Ser Asn Val Ile Le - #u Lys Lys Tyr Arg Asn     145                 1 - #50                 1 - #55                 1 -     #60     - Met Val Val Arg Ala Cys Gly Cys His                     165     - (2) INFORMATION FOR SEQ ID NO:10:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1004 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: YES     -    (iv) ANTI-SENSE: NO     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 1..951     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "OP1B"      FUSION"        /note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:10:     - ATG AAA GCA ATT TTC GTA CTG AAA GGT TCA CT - #G GAC AGA GAT CTG GAC       48     Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - TCT CGT CTG GAT CTG GAC GTT CGT ACC GAC CA - #C AAA GAC CTG TCT GAT       96     Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - CAC CTG GTT CTG GTC GAC CTG GCT CGT AAC GA - #C CTG GCT CGT ATC GTT      144     His Leu Val Leu Val Asp Leu Ala Arg Asn As - #p Leu Ala Arg Ile Val     #         45     - ACT CCC GGG TCT CGT TAC GTT GCG GAT CTG GA - #A TTC CGG ATC TAC AAG      192     Thr Pro Gly Ser Arg Tyr Val Ala Asp Leu Gl - #u Phe Arg Ile Tyr Lys     #     60     - GAC TAC ATC CGG GAA CGC TTC GAC AAT GAG AC - #G TTC CGG ATC AGC GTT      240     Asp Tyr Ile Arg Glu Arg Phe Asp Asn Glu Th - #r Phe Arg Ile Ser Val     # 80     - TAT CAG GTG CTC CAG GAG CAC TTG GGC AGG GA - #A TCG GAT CTC TTC CTG      288     Tyr Gln Val Leu Gln Glu His Leu Gly Arg Gl - #u Ser Asp Leu Phe Leu     #                 95     - CTC GAC AGC CGT ACC CTC TGG GCC TCG GAG GA - #G GGC TGG CTG GTG TTT      336     Leu Asp Ser Arg Thr Leu Trp Ala Ser Glu Gl - #u Gly Trp Leu Val Phe     #           110     - GAC ATC ACA GCC ACC AGC AAC CAC TGG GTG GT - #C AAT CCG CGG CAC AAC      384     Asp Ile Thr Ala Thr Ser Asn His Trp Val Va - #l Asn Pro Arg His Asn     #       125     - CTG GGC CTG CAG CTC TCG GTG GAG ACG CTG GA - #T GGG CAG AGC ATC AAC      432     Leu Gly Leu Gln Leu Ser Val Glu Thr Leu As - #p Gly Gln Ser Ile Asn     #   140     - CCC AAG TTG GCG GGC CTG ATT GGG CGG CAC GG - #G CCC CAG AAC AAG CAG      480     Pro Lys Leu Ala Gly Leu Ile Gly Arg His Gl - #y Pro Gln Asn Lys Gln     145                 1 - #50                 1 - #55                 1 -     #60     - CCC TTC ATG GTG GCT TTC TTC AAG GCC ACG GA - #G GTC CAC TTC CGC AGC      528     Pro Phe Met Val Ala Phe Phe Lys Ala Thr Gl - #u Val His Phe Arg Ser     #               175     - ATC CGG TCC ACG GGG AGC AAA CAG CGC AGC CA - #G AAC CGC TCC AAG ACG      576     Ile Arg Ser Thr Gly Ser Lys Gln Arg Ser Gl - #n Asn Arg Ser Lys Thr     #           190     - CCC AAG AAC CAG GAA GCC CTG CGG ATG GCC AA - #C GTG GCA GAG AAC AGC      624     Pro Lys Asn Gln Glu Ala Leu Arg Met Ala As - #n Val Ala Glu Asn Ser     #       205     - AGC AGC GAC CAG AGG CAG GCC TGT AAG AAG CA - #C GAG CTG TAT GTC AGC      672     Ser Ser Asp Gln Arg Gln Ala Cys Lys Lys Hi - #s Glu Leu Tyr Val Ser     #   220     - TTC CGA GAC CTG GGC TGG CAG GAC TGG ATC AT - #C GCG CCT GAA GGC TAC      720     Phe Arg Asp Leu Gly Trp Gln Asp Trp Ile Il - #e Ala Pro Glu Gly Tyr     225                 2 - #30                 2 - #35                 2 -     #40     - GCC GCC TAC TAC TGT GAG GGG GAG TGT GCC TT - #C CCT CTG AAC TCC TAC      768     Ala Ala Tyr Tyr Cys Glu Gly Glu Cys Ala Ph - #e Pro Leu Asn Ser Tyr     #               255     - ATG AAC GCC ACC AAC CAC GCC ATC GTG CAG AC - #G CTG GTC CAC TTC ATC      816     Met Asn Ala Thr Asn His Ala Ile Val Gln Th - #r Leu Val His Phe Ile     #           270     - AAC CCG GAA ACG GTG CCC AAG CCC TGC TGT GC - #G CCC ACG CAG CTC AAT      864     Asn Pro Glu Thr Val Pro Lys Pro Cys Cys Al - #a Pro Thr Gln Leu Asn     #       285     - GCC ATC TCC GTC CTC TAC TTC GAT GAC AGC TC - #C AAC GTC ATC CTG AAG      912     Ala Ile Ser Val Leu Tyr Phe Asp Asp Ser Se - #r Asn Val Ile Leu Lys     #   300     - AAA TAC AGA AAC ATG GTG GTC CGG GCC TGT GG - #C TGC CAC TAGCTCCTTC      961     Lys Tyr Arg Asn Met Val Val Arg Ala Cys Gl - #y Cys His     305                 3 - #10                 3 - #15     #                 100 - #4CCCAAAGG TTTTTCTGGA TCC     - (2) INFORMATION FOR SEQ ID NO:11:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 317 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:11:     - Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - His Leu Val Leu Val Asp Leu Ala Arg Asn As - #p Leu Ala Arg Ile Val     #         45     - Thr Pro Gly Ser Arg Tyr Val Ala Asp Leu Gl - #u Phe Arg Ile Tyr Lys     #     60     - Asp Tyr Ile Arg Glu Arg Phe Asp Asn Glu Th - #r Phe Arg Ile Ser Val     # 80     - Tyr Gln Val Leu Gln Glu His Leu Gly Arg Gl - #u Ser Asp Leu Phe Leu     #                 95     - Leu Asp Ser Arg Thr Leu Trp Ala Ser Glu Gl - #u Gly Trp Leu Val Phe     #           110     - Asp Ile Thr Ala Thr Ser Asn His Trp Val Va - #l Asn Pro Arg His Asn     #       125     - Leu Gly Leu Gln Leu Ser Val Glu Thr Leu As - #p Gly Gln Ser Ile Asn     #   140     - Pro Lys Leu Ala Gly Leu Ile Gly Arg His Gl - #y Pro Gln Asn Lys Gln     145                 1 - #50                 1 - #55                 1 -     #60     - Pro Phe Met Val Ala Phe Phe Lys Ala Thr Gl - #u Val His Phe Arg Ser     #               175     - Ile Arg Ser Thr Gly Ser Lys Gln Arg Ser Gl - #n Asn Arg Ser Lys Thr     #           190     - Pro Lys Asn Gln Glu Ala Leu Arg Met Ala As - #n Val Ala Glu Asn Ser     #       205     - Ser Ser Asp Gln Arg Gln Ala Cys Lys Lys Hi - #s Glu Leu Tyr Val Ser     #   220     - Phe Arg Asp Leu Gly Trp Gln Asp Trp Ile Il - #e Ala Pro Glu Gly Tyr     225                 2 - #30                 2 - #35                 2 -     #40     - Ala Ala Tyr Tyr Cys Glu Gly Glu Cys Ala Ph - #e Pro Leu Asn Ser Tyr     #               255     - Met Asn Ala Thr Asn His Ala Ile Val Gln Th - #r Leu Val His Phe Ile     #           270     - Asn Pro Glu Thr Val Pro Lys Pro Cys Cys Al - #a Pro Thr Gln Leu Asn     #       285     - Ala Ile Ser Val Leu Tyr Phe Asp Asp Ser Se - #r Asn Val Ile Leu Lys     #   300     - Lys Tyr Arg Asn Met Val Val Arg Ala Cys Gl - #y Cys His     305                 3 - #10                 3 - #15     - (2) INFORMATION FOR SEQ ID NO:12:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1505 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: YES     -     (iv) ANTI-SENSE: NO     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 1..1452     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "OP1C"      FUSION"        /note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:12:     - ATG AAA GCA ATT TTC GTA CTG AAA GGT TCA CT - #G GAC AGA GAT CTG GAC       48     Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - TCT CGT CTG GAT CTG GAC GTT CGT ACC GAC CA - #C AAA GAC CTG TCT GAT       96     Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - CAC CTG GTT CTG GTC GAC CTG GCT CGT AAC GA - #G AAT TCC CGG GTA GCG      144     His Leu Val Leu Val Asp Leu Ala Arg Asn Gl - #u Asn Ser Arg Val Ala     #         45     - CGT AGA GCC GGC GCG ATG CAC GTG CGC TCA CT - #G CGA GCT GCG GCG CCG      192     Arg Arg Ala Gly Ala Met His Val Arg Ser Le - #u Arg Ala Ala Ala Pro     #     60     - CAC AGC TTC GTG GCG CTC TGG GCA CCC CTG TT - #C CTG CTG CGC TCC GCC      240     His Ser Phe Val Ala Leu Trp Ala Pro Leu Ph - #e Leu Leu Arg Ser Ala     # 80     - CTG GCC GAC TTC AGC CTG GAC AAC GAG GTG CA - #C TCG AGC TTC ATC CAC      288     Leu Ala Asp Phe Ser Leu Asp Asn Glu Val Hi - #s Ser Ser Phe Ile His     #                 95     - CGG CGC CTC CGC AGC CAG GAG CGG CGG GAG AT - #G CAG CGC GAG ATC CTC      336     Arg Arg Leu Arg Ser Gln Glu Arg Arg Glu Me - #t Gln Arg Glu Ile Leu     #           110     - TCC ATT TTG GGC TTG CCC CAC CGC CCG CGC CC - #G CAC CTC CAG GGC AAG      384     Ser Ile Leu Gly Leu Pro His Arg Pro Arg Pr - #o His Leu Gln Gly Lys     #       125     - CAC AAC TCG GCA CCC ATG TTC ATG CTG GAC CT - #G TAC AAC GCC CAT GGC      432     His Asn Ser Ala Pro Met Phe Met Leu Asp Le - #u Tyr Asn Ala His Gly     #   140     - GGT GGA GGA GGG CGG CGG CCC GGC GGC CAG GG - #C TTC TCC TAC CCC TAC      480     Gly Gly Gly Gly Arg Arg Pro Gly Gly Gln Gl - #y Phe Ser Tyr Pro Tyr     145                 1 - #50                 1 - #55                 1 -     #60     - AAG GCC GTC TTC AGT ACC CAG GGC CCC CCT CT - #G GCC AGC CTG CAA GAT      528     Lys Ala Val Phe Ser Thr Gln Gly Pro Pro Le - #u Ala Ser Leu Gln Asp     #               175     - AGC CAT TTC CTC ACC GAC GCC GAC ATG GTC AT - #G AGC TTC GTC AAC CTC      576     Ser His Phe Leu Thr Asp Ala Asp Met Val Me - #t Ser Phe Val Asn Leu     #           190     - GTG GAA CAT GAC AAG GAA TTC TTC CAC CCA CG - #C TAC CAC CAT CGA GAG      624     Val Glu His Asp Lys Glu Phe Phe His Pro Ar - #g Tyr His His Arg Glu     #       205     - TTC CGG TTT GAT CTT TCC AAG ATC CCA GAA GG - #G GAA GCT GTC ACG GCA      672     Phe Arg Phe Asp Leu Ser Lys Ile Pro Glu Gl - #y Glu Ala Val Thr Ala     #   220     - GCC GAA TTC CGG ATC TAC AAG GAC TAC ATC CG - #G GAA CGC TTC GAC AAT      720     Ala Glu Phe Arg Ile Tyr Lys Asp Tyr Ile Ar - #g Glu Arg Phe Asp Asn     225                 2 - #30                 2 - #35                 2 -     #40     - GAG ACG TTC CGG ATC AGC GTT TAT CAG GTG CT - #C CAG GAG CAC TTG GGC      768     Glu Thr Phe Arg Ile Ser Val Tyr Gln Val Le - #u Gln Glu His Leu Gly     #               255     - AGG GAA TCG GAT CTC TTC CTG CTC GAC AGC CG - #T ACC CTC TGG GCC TCG      816     Arg Glu Ser Asp Leu Phe Leu Leu Asp Ser Ar - #g Thr Leu Trp Ala Ser     #           270     - GAG GAG GGC TGG CTG GTG TTT GAC ATC ACA GC - #C ACC AGC AAC CAC TGG      864     Glu Glu Gly Trp Leu Val Phe Asp Ile Thr Al - #a Thr Ser Asn His Trp     #       285     - GTG GTC AAT CCG CGG CAC AAC CTG GGC CTG CA - #G CTC TCG GTG GAG ACG      912     Val Val Asn Pro Arg His Asn Leu Gly Leu Gl - #n Leu Ser Val Glu Thr     #   300     - CTG GAT GGG CAG AGC ATC AAC CCC AAG TTG GC - #G GGC CTG ATT GGG CGG      960     Leu Asp Gly Gln Ser Ile Asn Pro Lys Leu Al - #a Gly Leu Ile Gly Arg     305                 3 - #10                 3 - #15                 3 -     #20     - CAC GGG CCC CAG AAC AAG CAG CCC TTC ATG GT - #G GCT TTC TTC AAG GCC     1008     His Gly Pro Gln Asn Lys Gln Pro Phe Met Va - #l Ala Phe Phe Lys Ala     #               335     - ACG GAG GTC CAC TTC CGC AGC ATC CGG TCC AC - #G GGG AGC AAA CAG CGC     1056     Thr Glu Val His Phe Arg Ser Ile Arg Ser Th - #r Gly Ser Lys Gln Arg     #           350     - AGC CAG AAC CGC TCC AAG ACG CCC AAG AAC CA - #G GAA GCC CTG CGG ATG     1104     Ser Gln Asn Arg Ser Lys Thr Pro Lys Asn Gl - #n Glu Ala Leu Arg Met     #       365     - GCC AAC GTG GCA GAG AAC AGC AGC AGC GAC CA - #G AGG CAG GCC TGT AAG     1152     Ala Asn Val Ala Glu Asn Ser Ser Ser Asp Gl - #n Arg Gln Ala Cys Lys     #   380     - AAG CAC GAG CTG TAT GTC AGC TTC CGA GAC CT - #G GGC TGG CAG GAC TGG     1200     Lys His Glu Leu Tyr Val Ser Phe Arg Asp Le - #u Gly Trp Gln Asp Trp     385                 3 - #90                 3 - #95                 4 -     #00     - ATC ATC GCG CCT GAA GGC TAC GCC GCC TAC TA - #C TGT GAG GGG GAG TGT     1248     Ile Ile Ala Pro Glu Gly Tyr Ala Ala Tyr Ty - #r Cys Glu Gly Glu Cys     #               415     - GCC TTC CCT CTG AAC TCC TAC ATG AAC GCC AC - #C AAC CAC GCC ATC GTG     1296     Ala Phe Pro Leu Asn Ser Tyr Met Asn Ala Th - #r Asn His Ala Ile Val     #           430     - CAG ACG CTG GTC CAC TTC ATC AAC CCG GAA AC - #G GTG CCC AAG CCC TGC     1344     Gln Thr Leu Val His Phe Ile Asn Pro Glu Th - #r Val Pro Lys Pro Cys     #       445     - TGT GCG CCC ACG CAG CTC AAT GCC ATC TCC GT - #C CTC TAC TTC GAT GAC     1392     Cys Ala Pro Thr Gln Leu Asn Ala Ile Ser Va - #l Leu Tyr Phe Asp Asp     #   460     - AGC TCC AAC GTC ATC CTG AAG AAA TAC AGA AA - #C ATG GTG GTC CGG GCC     1440     Ser Ser Asn Val Ile Leu Lys Lys Tyr Arg As - #n Met Val Val Arg Ala     465                 4 - #70                 4 - #75                 4 -     #80     - TGT GGC TGC CAC TAGCTCCTTC CGAGAATTCC AGACCTTTGG GG - #CCCAAAGG     1492     Cys Gly Cys His     - TTTTTCTGGA TCC     - (2) INFORMATION FOR SEQ ID NO:13:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 484 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:13:     - Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - His Leu Val Leu Val Asp Leu Ala Arg Asn Gl - #u Asn Ser Arg Val Ala     #         45     - Arg Arg Ala Gly Ala Met His Val Arg Ser Le - #u Arg Ala Ala Ala Pro     #     60     - His Ser Phe Val Ala Leu Trp Ala Pro Leu Ph - #e Leu Leu Arg Ser Ala     # 80     - Leu Ala Asp Phe Ser Leu Asp Asn Glu Val Hi - #s Ser Ser Phe Ile His     #                 95     - Arg Arg Leu Arg Ser Gln Glu Arg Arg Glu Me - #t Gln Arg Glu Ile Leu     #           110     - Ser Ile Leu Gly Leu Pro His Arg Pro Arg Pr - #o His Leu Gln Gly Lys     #       125     - His Asn Ser Ala Pro Met Phe Met Leu Asp Le - #u Tyr Asn Ala His Gly     #   140     - Gly Gly Gly Gly Arg Arg Pro Gly Gly Gln Gl - #y Phe Ser Tyr Pro Tyr     145                 1 - #50                 1 - #55                 1 -     #60     - Lys Ala Val Phe Ser Thr Gln Gly Pro Pro Le - #u Ala Ser Leu Gln Asp     #               175     - Ser His Phe Leu Thr Asp Ala Asp Met Val Me - #t Ser Phe Val Asn Leu     #           190     - Val Glu His Asp Lys Glu Phe Phe His Pro Ar - #g Tyr His His Arg Glu     #       205     - Phe Arg Phe Asp Leu Ser Lys Ile Pro Glu Gl - #y Glu Ala Val Thr Ala     #   220     - Ala Glu Phe Arg Ile Tyr Lys Asp Tyr Ile Ar - #g Glu Arg Phe Asp Asn     225                 2 - #30                 2 - #35                 2 -     #40     - Glu Thr Phe Arg Ile Ser Val Tyr Gln Val Le - #u Gln Glu His Leu Gly     #               255     - Arg Glu Ser Asp Leu Phe Leu Leu Asp Ser Ar - #g Thr Leu Trp Ala Ser     #           270     - Glu Glu Gly Trp Leu Val Phe Asp Ile Thr Al - #a Thr Ser Asn His Trp     #       285     - Val Val Asn Pro Arg His Asn Leu Gly Leu Gl - #n Leu Ser Val Glu Thr     #   300     - Leu Asp Gly Gln Ser Ile Asn Pro Lys Leu Al - #a Gly Leu Ile Gly Arg     305                 3 - #10                 3 - #15                 3 -     #20     - His Gly Pro Gln Asn Lys Gln Pro Phe Met Va - #l Ala Phe Phe Lys Ala     #               335     - Thr Glu Val His Phe Arg Ser Ile Arg Ser Th - #r Gly Ser Lys Gln Arg     #           350     - Ser Gln Asn Arg Ser Lys Thr Pro Lys Asn Gl - #n Glu Ala Leu Arg Met     #       365     - Ala Asn Val Ala Glu Asn Ser Ser Ser Asp Gl - #n Arg Gln Ala Cys Lys     #   380     - Lys His Glu Leu Tyr Val Ser Phe Arg Asp Le - #u Gly Trp Gln Asp Trp     385                 3 - #90                 3 - #95                 4 -     #00     - Ile Ile Ala Pro Glu Gly Tyr Ala Ala Tyr Ty - #r Cys Glu Gly Glu Cys     #               415     - Ala Phe Pro Leu Asn Ser Tyr Met Asn Ala Th - #r Asn His Ala Ile Val     #           430     - Gln Thr Leu Val His Phe Ile Asn Pro Glu Th - #r Val Pro Lys Pro Cys     #       445     - Cys Ala Pro Thr Gln Leu Asn Ala Ile Ser Va - #l Leu Tyr Phe Asp Asp     #   460     - Ser Ser Asn Val Ile Leu Lys Lys Tyr Arg As - #n Met Val Val Arg Ala     465                 4 - #70                 4 - #75                 4 -     #80     - Cys Gly Cys His     - (2) INFORMATION FOR SEQ ID NO:14:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1277 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: YES     -     (iv) ANTI-SENSE: NO     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 1..1224     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "OP1D"      FUSION"        /note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:14:     - ATG AAA GCA ATT TTC GTA CTG AAA GGT TCA CT - #G GAC AGA GAT CCG TCG       48     Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Pro Ser     #                 15     - AGC TTC ATC CAC CGG CGC CTC CGC AGC CAG GA - #G CGG CGG GAG ATG CAG       96     Ser Phe Ile His Arg Arg Leu Arg Ser Gln Gl - #u Arg Arg Glu Met Gln     #             30     - CGC GAG ATC CTC TCC ATT TTG GGC TTG CCC CA - #C CGC CCG CGC CCG CAC      144     Arg Glu Ile Leu Ser Ile Leu Gly Leu Pro Hi - #s Arg Pro Arg Pro His     #         45     - CTC CAG GGC AAG CAC AAC TCG GCA CCC ATG TT - #C ATG CTG GAC CTG TAC      192     Leu Gln Gly Lys His Asn Ser Ala Pro Met Ph - #e Met Leu Asp Leu Tyr     #     60     - AAC GCC CAT GGC GGT GGA GGA GGG CGG CGG CC - #C GGC GGC CAG GGC TTC      240     Asn Ala His Gly Gly Gly Gly Gly Arg Arg Pr - #o Gly Gly Gln Gly Phe     # 80     - TCC TAC CCC TAC AAG GCC GTC TTC AGT ACC CA - #G GGC CCC CCT CTG GCC      288     Ser Tyr Pro Tyr Lys Ala Val Phe Ser Thr Gl - #n Gly Pro Pro Leu Ala     #                 95     - AGC CTG CAA GAT AGC CAT TTC CTC ACC GAC GC - #C GAC ATG GTC ATG AGC      336     Ser Leu Gln Asp Ser His Phe Leu Thr Asp Al - #a Asp Met Val Met Ser     #           110     - TTC GTC AAC CTC GTG GAA CAT GAC AAG GAA TT - #C TTC CAC CCA CGC TAC      384     Phe Val Asn Leu Val Glu His Asp Lys Glu Ph - #e Phe His Pro Arg Tyr     #       125     - CAC CAT CGA GAG TTC CGG TTT GAT CTT TCC AA - #G ATC CCA GAA GGG GAA      432     His His Arg Glu Phe Arg Phe Asp Leu Ser Ly - #s Ile Pro Glu Gly Glu     #   140     - GCT GTC ACG GCA GCC GAA TTC CGG ATC TAC AA - #G GAC TAC ATC CGG GAA      480     Ala Val Thr Ala Ala Glu Phe Arg Ile Tyr Ly - #s Asp Tyr Ile Arg Glu     145                 1 - #50                 1 - #55                 1 -     #60     - CGC TTC GAC AAT GAG ACG TTC CGG ATC AGC GT - #T TAT CAG GTG CTC CAG      528     Arg Phe Asp Asn Glu Thr Phe Arg Ile Ser Va - #l Tyr Gln Val Leu Gln     #               175     - GAG CAC TTG GGC AGG GAA TCG GAT CTC TTC CT - #G CTC GAC AGC CGT ACC      576     Glu His Leu Gly Arg Glu Ser Asp Leu Phe Le - #u Leu Asp Ser Arg Thr     #           190     - CTC TGG GCC TCG GAG GAG GGC TGG CTG GTG TT - #T GAC ATC ACA GCC ACC      624     Leu Trp Ala Ser Glu Glu Gly Trp Leu Val Ph - #e Asp Ile Thr Ala Thr     #       205     - AGC AAC CAC TGG GTG GTC AAT CCG CGG CAC AA - #C CTG GGC CTG CAG CTC      672     Ser Asn His Trp Val Val Asn Pro Arg His As - #n Leu Gly Leu Gln Leu     #   220     - TCG GTG GAG ACG CTG GAT GGG CAG AGC ATC AA - #C CCC AAG TTG GCG GGC      720     Ser Val Glu Thr Leu Asp Gly Gln Ser Ile As - #n Pro Lys Leu Ala Gly     225                 2 - #30                 2 - #35                 2 -     #40     - CTG ATT GGG CGG CAC GGG CCC CAG AAC AAG CA - #G CCC TTC ATG GTG GCT      768     Leu Ile Gly Arg His Gly Pro Gln Asn Lys Gl - #n Pro Phe Met Val Ala     #               255     - TTC TTC AAG GCC ACG GAG GTC CAC TTC CGC AG - #C ATC CGG TCC ACG GGG      816     Phe Phe Lys Ala Thr Glu Val His Phe Arg Se - #r Ile Arg Ser Thr Gly     #           270     - AGC AAA CAG CGC AGC CAG AAC CGC TCC AAG AC - #G CCC AAG AAC CAG GAA      864     Ser Lys Gln Arg Ser Gln Asn Arg Ser Lys Th - #r Pro Lys Asn Gln Glu     #       285     - GCC CTG CGG ATG GCC AAC GTG GCA GAG AAC AG - #C AGC AGC GAC CAG AGG      912     Ala Leu Arg Met Ala Asn Val Ala Glu Asn Se - #r Ser Ser Asp Gln Arg     #   300     - CAG GCC TGT AAG AAG CAC GAG CTG TAT GTC AG - #C TTC CGA GAC CTG GGC      960     Gln Ala Cys Lys Lys His Glu Leu Tyr Val Se - #r Phe Arg Asp Leu Gly     305                 3 - #10                 3 - #15                 3 -     #20     - TGG CAG GAC TGG ATC ATC GCG CCT GAA GGC TA - #C GCC GCC TAC TAC TGT     1008     Trp Gln Asp Trp Ile Ile Ala Pro Glu Gly Ty - #r Ala Ala Tyr Tyr Cys     #               335     - GAG GGG GAG TGT GCC TTC CCT CTG AAC TCC TA - #C ATG AAC GCC ACC AAC     1056     Glu Gly Glu Cys Ala Phe Pro Leu Asn Ser Ty - #r Met Asn Ala Thr Asn     #           350     - CAC GCC ATC GTG CAG ACG CTG GTC CAC TTC AT - #C AAC CCG GAA ACG GTG     1104     His Ala Ile Val Gln Thr Leu Val His Phe Il - #e Asn Pro Glu Thr Val     #       365     - CCC AAG CCC TGC TGT GCG CCC ACG CAG CTC AA - #T GCC ATC TCC GTC CTC     1152     Pro Lys Pro Cys Cys Ala Pro Thr Gln Leu As - #n Ala Ile Ser Val Leu     #   380     - TAC TTC GAT GAC AGC TCC AAC GTC ATC CTG AA - #G AAA TAC AGA AAC ATG     1200     Tyr Phe Asp Asp Ser Ser Asn Val Ile Leu Ly - #s Lys Tyr Arg Asn Met     385                 3 - #90                 3 - #95                 4 -     #00     - GTG GTC CGG GCC TGT GGC TGC CAC TAGCTCCTTC CG - #AGAATTCC AGACCTTTGG     1254     Val Val Arg Ala Cys Gly Cys His                     405     #              1277TGGA TCC     - (2) INFORMATION FOR SEQ ID NO:15:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 408 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:15:     - Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Pro Ser     #                 15     - Ser Phe Ile His Arg Arg Leu Arg Ser Gln Gl - #u Arg Arg Glu Met Gln     #             30     - Arg Glu Ile Leu Ser Ile Leu Gly Leu Pro Hi - #s Arg Pro Arg Pro His     #         45     - Leu Gln Gly Lys His Asn Ser Ala Pro Met Ph - #e Met Leu Asp Leu Tyr     #     60     - Asn Ala His Gly Gly Gly Gly Gly Arg Arg Pr - #o Gly Gly Gln Gly Phe     # 80     - Ser Tyr Pro Tyr Lys Ala Val Phe Ser Thr Gl - #n Gly Pro Pro Leu Ala     #                 95     - Ser Leu Gln Asp Ser His Phe Leu Thr Asp Al - #a Asp Met Val Met Ser     #           110     - Phe Val Asn Leu Val Glu His Asp Lys Glu Ph - #e Phe His Pro Arg Tyr     #       125     - His His Arg Glu Phe Arg Phe Asp Leu Ser Ly - #s Ile Pro Glu Gly Glu     #   140     - Ala Val Thr Ala Ala Glu Phe Arg Ile Tyr Ly - #s Asp Tyr Ile Arg Glu     145                 1 - #50                 1 - #55                 1 -     #60     - Arg Phe Asp Asn Glu Thr Phe Arg Ile Ser Va - #l Tyr Gln Val Leu Gln     #               175     - Glu His Leu Gly Arg Glu Ser Asp Leu Phe Le - #u Leu Asp Ser Arg Thr     #           190     - Leu Trp Ala Ser Glu Glu Gly Trp Leu Val Ph - #e Asp Ile Thr Ala Thr     #       205     - Ser Asn His Trp Val Val Asn Pro Arg His As - #n Leu Gly Leu Gln Leu     #   220     - Ser Val Glu Thr Leu Asp Gly Gln Ser Ile As - #n Pro Lys Leu Ala Gly     225                 2 - #30                 2 - #35                 2 -     #40     - Leu Ile Gly Arg His Gly Pro Gln Asn Lys Gl - #n Pro Phe Met Val Ala     #               255     - Phe Phe Lys Ala Thr Glu Val His Phe Arg Se - #r Ile Arg Ser Thr Gly     #           270     - Ser Lys Gln Arg Ser Gln Asn Arg Ser Lys Th - #r Pro Lys Asn Gln Glu     #       285     - Ala Leu Arg Met Ala Asn Val Ala Glu Asn Se - #r Ser Ser Asp Gln Arg     #   300     - Gln Ala Cys Lys Lys His Glu Leu Tyr Val Se - #r Phe Arg Asp Leu Gly     305                 3 - #10                 3 - #15                 3 -     #20     - Trp Gln Asp Trp Ile Ile Ala Pro Glu Gly Ty - #r Ala Ala Tyr Tyr Cys     #               335     - Glu Gly Glu Cys Ala Phe Pro Leu Asn Ser Ty - #r Met Asn Ala Thr Asn     #           350     - His Ala Ile Val Gln Thr Leu Val His Phe Il - #e Asn Pro Glu Thr Val     #       365     - Pro Lys Pro Cys Cys Ala Pro Thr Gln Leu As - #n Ala Ile Ser Val Leu     #   380     - Tyr Phe Asp Asp Ser Ser Asn Val Ile Leu Ly - #s Lys Tyr Arg Asn Met     385                 3 - #90                 3 - #95                 4 -     #00     - Val Val Arg Ala Cys Gly Cys His                     405     - (2) INFORMATION FOR SEQ ID NO:16:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 525 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: YES     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 1..516     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "CBMP2B-1"      FUSION"-1      /note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:16:     - ATG AAA GCA ATT TTC GTA CTG AAA GGT TCA CT - #G GAC AGA GAT CTG GAC       48     Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - TCT CGT CTG GAT CTG GAC GTT CGT ACC GAC CA - #C AAA GAC CTG TCT GAT       96     Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - CAC CTG GTT CTG GTC GAC CTG GCT CGT AAC GA - #C CTG GCT CGT ATC GTT      144     His Leu Val Leu Val Asp Leu Ala Arg Asn As - #p Leu Ala Arg Ile Val     #         45     - ACT CCC GGG TCT CGT TAC GTT GCG GAT CCT AA - #G CAT CAC TCA CAG CGG      192     Thr Pro Gly Ser Arg Tyr Val Ala Asp Pro Ly - #s His His Ser Gln Arg     #     60     - GCC AGG AAG AAG AAT AAG AAC TGC CGG CGC CA - #C TCG CTC TAT GTG GAC      240     Ala Arg Lys Lys Asn Lys Asn Cys Arg Arg Hi - #s Ser Leu Tyr Val Asp     # 80     - TTC AGC GAT GTG GGC TGG AAT GAC TGG ATT GT - #G GCC CCA CCA GGC TAC      288     Phe Ser Asp Val Gly Trp Asn Asp Trp Ile Va - #l Ala Pro Pro Gly Tyr     #                 95     - CAG GCC TTC TAC TGC CAT GGC GAA TGC CCT TT - #C CCG CTA GCG GAT CAC      336     Gln Ala Phe Tyr Cys His Gly Glu Cys Pro Ph - #e Pro Leu Ala Asp His     #           110     - TTC AAC AGC ACC AAC CAC GCC GTG GTG CAG AC - #C CTG GTG AAC TCT GTC      384     Phe Asn Ser Thr Asn His Ala Val Val Gln Th - #r Leu Val Asn Ser Val     #       125     - AAC TCC AAG ATC CCT AAG GCT TGC TGC GTG CC - #C ACC GAG CTG TCC GCC      432     Asn Ser Lys Ile Pro Lys Ala Cys Cys Val Pr - #o Thr Glu Leu Ser Ala     #   140     - ATC AGC ATG CTG TAC CTG GAC GAG AAT GAG AA - #G GTG GTG CTG AAG AAC      480     Ile Ser Met Leu Tyr Leu Asp Glu Asn Glu Ly - #s Val Val Leu Lys Asn     145                 1 - #50                 1 - #55                 1 -     #60     - TAC CAG GAG ATG GTA GTA GAG GGC TGC GGC TG - #C CGC TAACTGCAG      52 - #5     Tyr Gln Glu Met Val Val Glu Gly Cys Gly Cy - #s Arg     #               170     - (2) INFORMATION FOR SEQ ID NO:17:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 172 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:17:     - Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - His Leu Val Leu Val Asp Leu Ala Arg Asn As - #p Leu Ala Arg Ile Val     #         45     - Thr Pro Gly Ser Arg Tyr Val Ala Asp Pro Ly - #s His His Ser Gln Arg     #     60     - Ala Arg Lys Lys Asn Lys Asn Cys Arg Arg Hi - #s Ser Leu Tyr Val Asp     # 80     - Phe Ser Asp Val Gly Trp Asn Asp Trp Ile Va - #l Ala Pro Pro Gly Tyr     #                 95     - Gln Ala Phe Tyr Cys His Gly Glu Cys Pro Ph - #e Pro Leu Ala Asp His     #           110     - Phe Asn Ser Thr Asn His Ala Val Val Gln Th - #r Leu Val Asn Ser Val     #       125     - Asn Ser Lys Ile Pro Lys Ala Cys Cys Val Pr - #o Thr Glu Leu Ser Ala     #   140     - Ile Ser Met Leu Tyr Leu Asp Glu Asn Glu Ly - #s Val Val Leu Lys Asn     145                 1 - #50                 1 - #55                 1 -     #60     - Tyr Gln Glu Met Val Val Glu Gly Cys Gly Cy - #s Arg     #               170     - (2) INFORMATION FOR SEQ ID NO:18:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1586 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -    (iii) HYPOTHETICAL: YES     -     (iv) ANTI-SENSE: NO     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 1..1257     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "CBMP2B-2"      FUSION"-2      /note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:18:     - ATG AAA GCA ATT TTC GTA CTG AAA GGT TCA CT - #G GAC AGA GAT CTG GAC       48     Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - TCT CGT CTG GAT CTG GAC GTT CGT ACC GAC CA - #C AAA GAC CTG TCT GAT       96     Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - CAC CTG GTT CTG GTC GAC CTG GCT CGT AAC GA - #C CTG GCT CGT ATC GTT      144     His Leu Val Leu Val Asp Leu Ala Arg Asn As - #p Leu Ala Arg Ile Val     #         45     - ACT CCC GGG TCT CGT TAC GTT GCG GAT CTG GA - #A TTC CCG GGA GAG CTC      192     Thr Pro Gly Ser Arg Tyr Val Ala Asp Leu Gl - #u Phe Pro Gly Glu Leu     #     60     - CTG CGG GAC TTC GAG GCG ACA CTT CTG CAG AT - #G TTT GGG CTG CGC CGC      240     Leu Arg Asp Phe Glu Ala Thr Leu Leu Gln Me - #t Phe Gly Leu Arg Arg     # 80     - CGC CCG CAG CCT AGC AAG AGT GCC GTC ATT CC - #G GAC TAC ATG CGG GAT      288     Arg Pro Gln Pro Ser Lys Ser Ala Val Ile Pr - #o Asp Tyr Met Arg Asp     #                 95     - CTT TAC CGG CTT CAG TCT GGG GAG GAG GAG GA - #A GAG CAG ATC CAC AGC      336     Leu Tyr Arg Leu Gln Ser Gly Glu Glu Glu Gl - #u Glu Gln Ile His Ser     #           110     - ACT GGT CTT GAG TAT CCT GAG CGC CCG GCC AG - #C CGG GCC AAC ACC GTG      384     Thr Gly Leu Glu Tyr Pro Glu Arg Pro Ala Se - #r Arg Ala Asn Thr Val     #       125     - AGG AGC TTC CAC CAC GAA GAA CAT CTG GAG AA - #C ATC CCA GGG ACC AGT      432     Arg Ser Phe His His Glu Glu His Leu Glu As - #n Ile Pro Gly Thr Ser     #   140     - GAA AAC TCT GCT TTT CGT TTC CTC TTT AAC CT - #C AGC AGC ATC CCT GAG      480     Glu Asn Ser Ala Phe Arg Phe Leu Phe Asn Le - #u Ser Ser Ile Pro Glu     145                 1 - #50                 1 - #55                 1 -     #60     - AAC GAG GCG ATC TCC TCT GCA GAG CTT CGG CT - #C TTC CGG GAG CAG GTG      528     Asn Glu Ala Ile Ser Ser Ala Glu Leu Arg Le - #u Phe Arg Glu Gln Val     #               175     - GAC CAG GGC CCT GAT TGG GAA AGG GGC TTC CA - #C CGT ATA AAC ATT TAT      576     Asp Gln Gly Pro Asp Trp Glu Arg Gly Phe Hi - #s Arg Ile Asn Ile Tyr     #           190     - GAG GTT ATG AAG CCC CCA GCA GAA GTG GTG CC - #T GGG CAC CTC ATC ACA      624     Glu Val Met Lys Pro Pro Ala Glu Val Val Pr - #o Gly His Leu Ile Thr     #       205     - CGA CTA CTG GAC ACG AGA CTG GTC CAC CAC AA - #T GTG ACA CGG TGG GAA      672     Arg Leu Leu Asp Thr Arg Leu Val His His As - #n Val Thr Arg Trp Glu     #   220     - ACT TTT GAT GTG AGC CCT GCG GTC CTT CGC TG - #G ACC CGG GAG AAG CAG      720     Thr Phe Asp Val Ser Pro Ala Val Leu Arg Tr - #p Thr Arg Glu Lys Gln     225                 2 - #30                 2 - #35                 2 -     #40     - CCA AAC TAT GGG CTA GCC ATT GAG GTG ACT CA - #C CTC CAT CAG ACT CGG      768     Pro Asn Tyr Gly Leu Ala Ile Glu Val Thr Hi - #s Leu His Gln Thr Arg     #               255     - ACC CAC CAG GGC CAG CAT GTC AGG ATT AGC CG - #A TCG TTA CCT CAA GGG      816     Thr His Gln Gly Gln His Val Arg Ile Ser Ar - #g Ser Leu Pro Gln Gly     #           270     - AGT GGG AAT TGG GCC CAG CTC CGG CCC CTC CT - #G GTC ACC TTT GGC CAT      864     Ser Gly Asn Trp Ala Gln Leu Arg Pro Leu Le - #u Val Thr Phe Gly His     #       285     - GAT GGC CGG GGC CAT GCC TTG ACC CGA CGC CG - #G AGG GCC AAG CGT AGC      912     Asp Gly Arg Gly His Ala Leu Thr Arg Arg Ar - #g Arg Ala Lys Arg Ser     #   300     - CCT AAG CAT CAC TCA CAG CGG GCC AGG AAG AA - #G AAT AAG AAC TGC CGG      960     Pro Lys His His Ser Gln Arg Ala Arg Lys Ly - #s Asn Lys Asn Cys Arg     305                 3 - #10                 3 - #15                 3 -     #20     - CGC CAC TCG CTC TAT GTG GAC TTC AGC GAT GT - #G GGC TGG AAT GAC TGG     1008     Arg His Ser Leu Tyr Val Asp Phe Ser Asp Va - #l Gly Trp Asn Asp Trp     #               335     - ATT GTG GCC CCA CCA GGC TAC CAG GCC TTC TA - #C TGC CAT GGG GAC TGC     1056     Ile Val Ala Pro Pro Gly Tyr Gln Ala Phe Ty - #r Cys His Gly Asp Cys     #           350     - CCC TTT CCA CTG GCT GAC CAC CTC AAC TCA AC - #C AAC CAT GCC ATT GTG     1104     Pro Phe Pro Leu Ala Asp His Leu Asn Ser Th - #r Asn His Ala Ile Val     #       365     - CAG ACC CTG GTC AAT TCT GTC AAT TCC AGT AT - #C CCC AAA GCC TGT TGT     1152     Gln Thr Leu Val Asn Ser Val Asn Ser Ser Il - #e Pro Lys Ala Cys Cys     #   380     - GTG CCC ACT GAA CTG AGT GCC ATC TCC ATG CT - #G TAC CTG GAT GAG TAT     1200     Val Pro Thr Glu Leu Ser Ala Ile Ser Met Le - #u Tyr Leu Asp Glu Tyr     385                 3 - #90                 3 - #95                 4 -     #00     - GAT AAG GTG GTA CTG AAA AAT TAT CAG GAG AT - #G GTA GTA GAG GGA TGT     1248     Asp Lys Val Val Leu Lys Asn Tyr Gln Glu Me - #t Val Val Glu Gly Cys     #               415     - GGG TGC CGC TGAGATCAGG CAGTCCTTGA GGATAGACAG ATATACACA - #C     1297     Gly Cys Arg     - ACACACACAC ACACCACATA CACCACACAC ACACGTTCCC ATCCACTCAC CC - #ACACACTA     1357     - CACAGACTGC TTCCTTATAG ATGGACTTTT ATTTAAAAAA AAAAAAAAAA AA - #ATGGAAAA     1417     - AATCCCTAAA CATTCACCTT GACCTTATTT ATGACTTTAC GTGCAAATGT TT - #TGACCATA     1477     - TTGATCATAT ATTTTGACAA AATATATTTA TAACTACGTA TTAAAAGAAA AA - #AATAAAAT     1537     #             1586AAAAA AAAAAAAAAC TCTAGAGTCG ACGGAATTC     - (2) INFORMATION FOR SEQ ID NO:19:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 419 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:19:     - Met Lys Ala Ile Phe Val Leu Lys Gly Ser Le - #u Asp Arg Asp Leu Asp     #                 15     - Ser Arg Leu Asp Leu Asp Val Arg Thr Asp Hi - #s Lys Asp Leu Ser Asp     #             30     - His Leu Val Leu Val Asp Leu Ala Arg Asn As - #p Leu Ala Arg Ile Val     #         45     - Thr Pro Gly Ser Arg Tyr Val Ala Asp Leu Gl - #u Phe Pro Gly Glu Leu     #     60     - Leu Arg Asp Phe Glu Ala Thr Leu Leu Gln Me - #t Phe Gly Leu Arg Arg     # 80     - Arg Pro Gln Pro Ser Lys Ser Ala Val Ile Pr - #o Asp Tyr Met Arg Asp     #                 95     - Leu Tyr Arg Leu Gln Ser Gly Glu Glu Glu Gl - #u Glu Gln Ile His Ser     #           110     - Thr Gly Leu Glu Tyr Pro Glu Arg Pro Ala Se - #r Arg Ala Asn Thr Val     #       125     - Arg Ser Phe His His Glu Glu His Leu Glu As - #n Ile Pro Gly Thr Ser     #   140     - Glu Asn Ser Ala Phe Arg Phe Leu Phe Asn Le - #u Ser Ser Ile Pro Glu     145                 1 - #50                 1 - #55                 1 -     #60     - Asn Glu Ala Ile Ser Ser Ala Glu Leu Arg Le - #u Phe Arg Glu Gln Val     #               175     - Asp Gln Gly Pro Asp Trp Glu Arg Gly Phe Hi - #s Arg Ile Asn Ile Tyr     #           190     - Glu Val Met Lys Pro Pro Ala Glu Val Val Pr - #o Gly His Leu Ile Thr     #       205     - Arg Leu Leu Asp Thr Arg Leu Val His His As - #n Val Thr Arg Trp Glu     #   220     - Thr Phe Asp Val Ser Pro Ala Val Leu Arg Tr - #p Thr Arg Glu Lys Gln     225                 2 - #30                 2 - #35                 2 -     #40     - Pro Asn Tyr Gly Leu Ala Ile Glu Val Thr Hi - #s Leu His Gln Thr Arg     #               255     - Thr His Gln Gly Gln His Val Arg Ile Ser Ar - #g Ser Leu Pro Gln Gly     #           270     - Ser Gly Asn Trp Ala Gln Leu Arg Pro Leu Le - #u Val Thr Phe Gly His     #       285     - Asp Gly Arg Gly His Ala Leu Thr Arg Arg Ar - #g Arg Ala Lys Arg Ser     #   300     - Pro Lys His His Ser Gln Arg Ala Arg Lys Ly - #s Asn Lys Asn Cys Arg     305                 3 - #10                 3 - #15                 3 -     #20     - Arg His Ser Leu Tyr Val Asp Phe Ser Asp Va - #l Gly Trp Asn Asp Trp     #               335     - Ile Val Ala Pro Pro Gly Tyr Gln Ala Phe Ty - #r Cys His Gly Asp Cys     #           350     - Pro Phe Pro Leu Ala Asp His Leu Asn Ser Th - #r Asn His Ala Ile Val     #       365     - Gln Thr Leu Val Asn Ser Val Asn Ser Ser Il - #e Pro Lys Ala Cys Cys     #   380     - Val Pro Thr Glu Leu Ser Ala Ile Ser Met Le - #u Tyr Leu Asp Glu Tyr     385                 3 - #90                 3 - #95                 4 -     #00     - Asp Lys Val Val Leu Lys Asn Tyr Gln Glu Me - #t Val Val Glu Gly Cys     #               415     - Gly Cys Arg     - (2) INFORMATION FOR SEQ ID NO:20:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 574 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: DNA (genomic)     -     (vi) ORIGINAL SOURCE:               (A) ORGANISM: HOMO SAPI - #ENS     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 1..327     #/product= "MATURE hCBMP3 (PARTIAL)"     #"THIS PARTIAL SEQUENCE OF THE     #    MATURE HUMAN CBMP3 PROTEIN     #    INCLUDE THE FIRST THREE     #    CYSTEINES OF THE CONSERVED 7     #    CYSTEINE SKELETON."     -     (ix) FEATURE:               (A) NAME/KEY: intron               (B) LOCATION: 328..574     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:20:     - CGA GCT TCT AAA ATA GAA TAC CAG TAT AAA AA - #G GAT GAG GTG TGG GAG       48     Arg Ala Ser Lys Ile Glu Tyr Gln Tyr Lys Ly - #s Asp Glu Val Trp Glu     #                 15     - GAG AGA AAG CCT TAC AAG ACC CTT CAG GGC TC - #A GGC CCT GAA AAG AGT       96     Glu Arg Lys Pro Tyr Lys Thr Leu Gln Gly Se - #r Gly Pro Glu Lys Ser     #             30     - AAG AAT AAA AAG AAA CAG AGA AAG GGG CCT CA - #T CGG AAG AGC CAG ACG      144     Lys Asn Lys Lys Lys Gln Arg Lys Gly Pro Hi - #s Arg Lys Ser Gln Thr     #         45     - CTC CAA TTT GAT GAG CAG ACC CTG AAA AAG GC - #A AGG AGA AAG CAG TGG      192     Leu Gln Phe Asp Glu Gln Thr Leu Lys Lys Al - #a Arg Arg Lys Gln Trp     #     60     - ATT GAA CCT CGG AAT TGC GCC AGG AGA TAC CT - #C AAG GTA GAC TTT GCA      240     Ile Glu Pro Arg Asn Cys Ala Arg Arg Tyr Le - #u Lys Val Asp Phe Ala     # 80     - GAT ATT GGC TGG AGT GAA TGG ATT ATC TCC CC - #C AAG TCC TTT GAT GCC      288     Asp Ile Gly Trp Ser Glu Trp Ile Ile Ser Pr - #o Lys Ser Phe Asp Ala     #                 95     - TAT TAT TGC TCT GGA GCA TGC CAG TTC CCC AT - #G CCA AAG GTAGCCATTG      337     Tyr Tyr Cys Ser Gly Ala Cys Gln Phe Pro Me - #t Pro Lys     #           105     - TTCTCTGTCC TGTACTTACT TCCTATTTCC ATTAGTAGAA AGACACATTG AC - #TAAGTTAG      397     - TGTGCATATA GGGGGTTTGT GTAAGTGTTT GTGTTTCCAT TTGCAAAATC CA - #TTGGGACC      457     - CTTATTTACT ACATTCTAAA CCATAATAGG TAATATGGTT ATTCTTGGTT TC - #TCTTTAAT      517     - GGTTGTTAAA GTCATATGAA GTCAGTATTG GTATAAAGAA GGATATGAGA AA - #AAAAA      574     - (2) INFORMATION FOR SEQ ID NO:21:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 109 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:21:     - Arg Ala Ser Lys Ile Glu Tyr Gln Tyr Lys Ly - #s Asp Glu Val Trp Glu     #                 15     - Glu Arg Lys Pro Tyr Lys Thr Leu Gln Gly Se - #r Gly Pro Glu Lys Ser     #             30     - Lys Asn Lys Lys Lys Gln Arg Lys Gly Pro Hi - #s Arg Lys Ser Gln Thr     #         45     - Leu Gln Phe Asp Glu Gln Thr Leu Lys Lys Al - #a Arg Arg Lys Gln Trp     #     60     - Ile Glu Pro Arg Asn Cys Ala Arg Arg Tyr Le - #u Lys Val Asp Phe Ala     # 80     - Asp Ile Gly Trp Ser Glu Trp Ile Ile Ser Pr - #o Lys Ser Phe Asp Ala     #                 95     - Tyr Tyr Cys Ser Gly Ala Cys Gln Phe Pro Me - #t Pro Lys     #           105     - (2) INFORMATION FOR SEQ ID NO:22:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 779 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -     (vi) ORIGINAL SOURCE:               (A) ORGANISM: MURINE     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 1..549     #/product= "MATURE mBMP3"MATION:     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:22:     - TCT ACG GGG GTC CTT CTG CCC TTG CAG AAC AA - #T GAG CTA CCT GGG GCA       48     Ser Thr Gly Val Leu Leu Pro Leu Gln Asn As - #n Glu Leu Pro Gly Ala     #                 15     - GAG TAT CAG TAC AAG GAG GAG GGA GCG TGG GA - #G GAG AGA AAG CCT TAT       96     Glu Tyr Gln Tyr Lys Glu Glu Gly Ala Trp Gl - #u Glu Arg Lys Pro Tyr     #             30     - AAG AGC CTT CAG ACT CAG CCC CCT GAG AAG AG - #T AGG AAC AAA AAG AAA      144     Lys Ser Leu Gln Thr Gln Pro Pro Glu Lys Se - #r Arg Asn Lys Lys Lys     #         45     - CAG AGG AAA GGG TCC CAT CAG AAG GGA CAG AC - #G CTG CAA TTT GAT GAG      192     Gln Arg Lys Gly Ser His Gln Lys Gly Gln Th - #r Leu Gln Phe Asp Glu     #     60     - CAG ACC CTG AAG AAG GCA AGG CGA AAG CAG TG - #G GTC GAA CCT CGG AAC      240     Gln Thr Leu Lys Lys Ala Arg Arg Lys Gln Tr - #p Val Glu Pro Arg Asn     # 80     - TGT GCC AGG AGG TAC CTT AAA GTG GAC TTT GC - #T GAT ATC GGC TGG AGC      288     Cys Ala Arg Arg Tyr Leu Lys Val Asp Phe Al - #a Asp Ile Gly Trp Ser     #                 95     - GAA TGG ATT ATC TCT CCC AAG TCA TTT GAT GC - #T TTC TAC TGC TCT GGA      336     Glu Trp Ile Ile Ser Pro Lys Ser Phe Asp Al - #a Phe Tyr Cys Ser Gly     #           110     - GCC TGC CAG TTC CCC ATG CCA AAG TCT TTG AA - #A CCA TCA AAT CAC GCC      384     Ala Cys Gln Phe Pro Met Pro Lys Ser Leu Ly - #s Pro Ser Asn His Ala     #       125     - ACC ATC CAG AGC ATA GTG CGA GCG GTG GGG GT - #C GTC TCC GGG ATT CCC      432     Thr Ile Gln Ser Ile Val Arg Ala Val Gly Va - #l Val Ser Gly Ile Pro     #   140     - GAG CCT TGC TGT GTG CCG GAA AAG ATG TCC TC - #A CTC AGC ATC TTG TTC      480     Glu Pro Cys Cys Val Pro Glu Lys Met Ser Se - #r Leu Ser Ile Leu Phe     145                 1 - #50                 1 - #55                 1 -     #60     - TTT GAT GAA AAC AAG AAT GTA GTG CTC AAA GT - #C TAC CCT AAC ATG ACA      528     Phe Asp Glu Asn Lys Asn Val Val Leu Lys Va - #l Tyr Pro Asn Met Thr     #               175     - GTC GAC TCC TGT GCT TGT AGA TAACCTCTTC AAGAACTCA - #C AGATGCTCCA      579     Val Asp Ser Cys Ala Cys Arg                 180     - TCCAATCACG AGTTGGGTTT TATGGGCTTT TTTTTTTTTT TTTTTGTCCC AA - #AAGATGTT      639     - TGATAGCAGG AAGAAAATGA ACAAATAGAT TGAAGGTTTC CACCAAACAA AA - #CCGGACTG      699     - TATTTTCCTT CGAATGTAAC TAAAAGTGAG ATTTTAGTAA ATGTGGATCT CT - #AAAAAAAA      759     #779               AAAA     - (2) INFORMATION FOR SEQ ID NO:23:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 183 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:23:     - Ser Thr Gly Val Leu Leu Pro Leu Gln Asn As - #n Glu Leu Pro Gly Ala     #                 15     - Glu Tyr Gln Tyr Lys Glu Glu Gly Ala Trp Gl - #u Glu Arg Lys Pro Tyr     #             30     - Lys Ser Leu Gln Thr Gln Pro Pro Glu Lys Se - #r Arg Asn Lys Lys Lys     #         45     - Gln Arg Lys Gly Ser His Gln Lys Gly Gln Th - #r Leu Gln Phe Asp Glu     #     60     - Gln Thr Leu Lys Lys Ala Arg Arg Lys Gln Tr - #p Val Glu Pro Arg Asn     # 80     - Cys Ala Arg Arg Tyr Leu Lys Val Asp Phe Al - #a Asp Ile Gly Trp Ser     #                 95     - Glu Trp Ile Ile Ser Pro Lys Ser Phe Asp Al - #a Phe Tyr Cys Ser Gly     #           110     - Ala Cys Gln Phe Pro Met Pro Lys Ser Leu Ly - #s Pro Ser Asn His Ala     #       125     - Thr Ile Gln Ser Ile Val Arg Ala Val Gly Va - #l Val Ser Gly Ile Pro     #   140     - Glu Pro Cys Cys Val Pro Glu Lys Met Ser Se - #r Leu Ser Ile Leu Phe     145                 1 - #50                 1 - #55                 1 -     #60     - Phe Asp Glu Asn Lys Asn Val Val Leu Lys Va - #l Tyr Pro Asn Met Thr     #               175     - Val Asp Ser Cys Ala Cys Arg                 180     - (2) INFORMATION FOR SEQ ID NO:24:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1873 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 104..1393     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "MOP1"     #"MOP1 CDNA"    /note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:24:     - CTGCAGCAAG TGACCTCGGG TCGTGGACCG CTGCCCTGCC CCCTCCGCTG CC - #ACCTGGGG       60     - CGGCGCGGGC CCGGTGCCCC GGATCGCGCG TAGAGCCGGC GCG ATG CA - #C GTG CGC      115     #            Met His Val Ar - #g     #             1     - TCG CTG CGC GCT GCG GCG CCA CAC AGC TTC GT - #G GCG CTC TGG GCG CCT      163     Ser Leu Arg Ala Ala Ala Pro His Ser Phe Va - #l Ala Leu Trp Ala Pro     #  20     - CTG TTC TTG CTG CGC TCC GCC CTG GCC GAT TT - #C AGC CTG GAC AAC GAG      211     Leu Phe Leu Leu Arg Ser Ala Leu Ala Asp Ph - #e Ser Leu Asp Asn Glu     #                 35     - GTG CAC TCC AGC TTC ATC CAC CGG CGC CTC CG - #C AGC CAG GAG CGG CGG      259     Val His Ser Ser Phe Ile His Arg Arg Leu Ar - #g Ser Gln Glu Arg Arg     #             50     - GAG ATG CAG CGG GAG ATC CTG TCC ATC TTA GG - #G TTG CCC CAT CGC CCG      307     Glu Met Gln Arg Glu Ile Leu Ser Ile Leu Gl - #y Leu Pro His Arg Pro     #         65     - CGC CCG CAC CTC CAG GGA AAG CAT AAT TCG GC - #G CCC ATG TTC ATG TTG      355     Arg Pro His Leu Gln Gly Lys His Asn Ser Al - #a Pro Met Phe Met Leu     #     80     - GAC CTG TAC AAC GCC ATG GCG GTG GAG GAG AG - #C GGG CCG GAC GGA CAG      403     Asp Leu Tyr Asn Ala Met Ala Val Glu Glu Se - #r Gly Pro Asp Gly Gln     #100     - GGC TTC TCC TAC CCC TAC AAG GCC GTC TTC AG - #T ACC CAG GGC CCC CCT      451     Gly Phe Ser Tyr Pro Tyr Lys Ala Val Phe Se - #r Thr Gln Gly Pro Pro     #               115     - TTA GCC AGC CTG CAG GAC AGC CAT TTC CTC AC - #T GAC GCC GAC ATG GTC      499     Leu Ala Ser Leu Gln Asp Ser His Phe Leu Th - #r Asp Ala Asp Met Val     #           130     - ATG AGC TTC GTC AAC CTA GTG GAA CAT GAC AA - #A GAA TTC TTC CAC CCT      547     Met Ser Phe Val Asn Leu Val Glu His Asp Ly - #s Glu Phe Phe His Pro     #       145     - CGA TAC CAC CAT CGG GAG TTC CGG TTT GAT CT - #T TCC AAG ATC CCC GAG      595     Arg Tyr His His Arg Glu Phe Arg Phe Asp Le - #u Ser Lys Ile Pro Glu     #   160     - GGC GAA CGG GTG ACC GCA GCC GAA TTC AGG AT - #C TAT AAG GAC TAC ATC      643     Gly Glu Arg Val Thr Ala Ala Glu Phe Arg Il - #e Tyr Lys Asp Tyr Ile     165                 1 - #70                 1 - #75                 1 -     #80     - CGG GAG CGA TTT GAC AAC GAG ACC TTC CAG AT - #C ACA GTC TAT CAG GTG      691     Arg Glu Arg Phe Asp Asn Glu Thr Phe Gln Il - #e Thr Val Tyr Gln Val     #               195     - CTC CAG GAG CAC TCA GGC AGG GAG TCG GAC CT - #C TTC TTG CTG GAC AGC      739     Leu Gln Glu His Ser Gly Arg Glu Ser Asp Le - #u Phe Leu Leu Asp Ser     #           210     - CGC ACC ATC TGG GCT TCT GAG GAG GGC TGG TT - #G GTG TTT GAT ATC ACA      787     Arg Thr Ile Trp Ala Ser Glu Glu Gly Trp Le - #u Val Phe Asp Ile Thr     #       225     - GCC ACC AGC AAC CAC TGG GTG GTC AAC CCT CG - #G CAC AAC CTG GGC TTA      835     Ala Thr Ser Asn His Trp Val Val Asn Pro Ar - #g His Asn Leu Gly Leu     #   240     - CAG CTC TCT GTG GAG ACC CTG GAT GGG CAG AG - #C ATC AAC CCC AAG TTG      883     Gln Leu Ser Val Glu Thr Leu Asp Gly Gln Se - #r Ile Asn Pro Lys Leu     245                 2 - #50                 2 - #55                 2 -     #60     - GCA GGC CTG ATT GGA CGG CAT GGA CCC CAG AA - #C AAG CAA CCC TTC ATG      931     Ala Gly Leu Ile Gly Arg His Gly Pro Gln As - #n Lys Gln Pro Phe Met     #               275     - GTG GCC TTC TTC AAG GCC ACG GAA GTC CAT CT - #C CGT AGT ATC CGG TCC      979     Val Ala Phe Phe Lys Ala Thr Glu Val His Le - #u Arg Ser Ile Arg Ser     #           290     - ACG GGG GGC AAG CAG CGC AGC CAG AAT CGC TC - #C AAG ACG CCA AAG AAC     1027     Thr Gly Gly Lys Gln Arg Ser Gln Asn Arg Se - #r Lys Thr Pro Lys Asn     #       305     - CAA GAG GCC CTG AGG ATG GCC AGT GTG GCA GA - #A AAC AGC AGC AGT GAC     1075     Gln Glu Ala Leu Arg Met Ala Ser Val Ala Gl - #u Asn Ser Ser Ser Asp     #   320     - CAG AGG CAG GCC TGC AAG AAA CAT GAG CTG TA - #C GTC AGC TTC CGA GAC     1123     Gln Arg Gln Ala Cys Lys Lys His Glu Leu Ty - #r Val Ser Phe Arg Asp     325                 3 - #30                 3 - #35                 3 -     #40     - CTT GGC TGG CAG GAC TGG ATC ATT GCA CCT GA - #A GGC TAT GCT GCC TAC     1171     Leu Gly Trp Gln Asp Trp Ile Ile Ala Pro Gl - #u Gly Tyr Ala Ala Tyr     #               355     - TAC TGT GAG GGA GAG TGC GCC TTC CCT CTG AA - #C TCC TAC ATG AAC GCC     1219     Tyr Cys Glu Gly Glu Cys Ala Phe Pro Leu As - #n Ser Tyr Met Asn Ala     #           370     - ACC AAC CAC GCC ATC GTC CAG ACA CTG GTT CA - #C TTC ATC AAC CCA GAC     1267     Thr Asn His Ala Ile Val Gln Thr Leu Val Hi - #s Phe Ile Asn Pro Asp     #       385     - ACA GTA CCC AAG CCC TGC TGT GCG CCC ACC CA - #G CTC AAC GCC ATC TCT     1315     Thr Val Pro Lys Pro Cys Cys Ala Pro Thr Gl - #n Leu Asn Ala Ile Ser     #   400     - GTC CTC TAC TTC GAC GAC AGC TCT AAT GTC AT - #C CTG AAG AAG TAC AGA     1363     Val Leu Tyr Phe Asp Asp Ser Ser Asn Val Il - #e Leu Lys Lys Tyr Arg     405                 4 - #10                 4 - #15                 4 -     #20     - AAC ATG GTG GTC CGG GCC TGT GGC TGC CAC TA - #GCTCTTCC TGAGACCCTG     1413     Asn Met Val Val Arg Ala Cys Gly Cys His     #               430     - ACCTTTGCGG GGCCACACCT TTCCAAATCT TCGATGTCTC ACCATCTAAG TC - #TCTCACTG     1473     - CCCACCTTGG CGAGGAGAAC AGACCAACCT CTCCTGAGCC TTCCCTCACC TC - #CCAACCGG     1533     - AAGCATGTAA GGGTTCCAGA AACCTGAGCG TGCAGCAGCT GATGAGCGCC CT - #TTCCTTCT     1593     - GGCACGTGAC GGACAAGATC CTACCAGCTA CCACAGCAAA CGCCTAAGAG CA - #GGAAAAAT     1653     - GTCTGCCAGG AAAGTGTCCA GTGTCCACAT GGCCCCTGGC GCTCTGAGTC TT - #TGAGGAGT     1713     - AATCGCAAGC CTCGTTCAGC TGCAGCAGAA GGAAGGGCTT AGCCAGGGTG GG - #CGCTGGCG     1773     - TCTGTGTTGA AGGGAAACCA AGCAGAAGCC ACTGTAATGA TATGTCACAA TA - #AAACCCAT     1833     #  1873            AAAA AAAAAAAAAA AAAAGAATTC     - (2) INFORMATION FOR SEQ ID NO:25:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 430 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:25:     - Met His Val Arg Ser Leu Arg Ala Ala Ala Pr - #o His Ser Phe Val Ala     #                 15     - Leu Trp Ala Pro Leu Phe Leu Leu Arg Ser Al - #a Leu Ala Asp Phe Ser     #             30     - Leu Asp Asn Glu Val His Ser Ser Phe Ile Hi - #s Arg Arg Leu Arg Ser     #         45     - Gln Glu Arg Arg Glu Met Gln Arg Glu Ile Le - #u Ser Ile Leu Gly Leu     #     60     - Pro His Arg Pro Arg Pro His Leu Gln Gly Ly - #s His Asn Ser Ala Pro     # 80     - Met Phe Met Leu Asp Leu Tyr Asn Ala Met Al - #a Val Glu Glu Ser Gly     #                 95     - Pro Asp Gly Gln Gly Phe Ser Tyr Pro Tyr Ly - #s Ala Val Phe Ser Thr     #           110     - Gln Gly Pro Pro Leu Ala Ser Leu Gln Asp Se - #r His Phe Leu Thr Asp     #       125     - Ala Asp Met Val Met Ser Phe Val Asn Leu Va - #l Glu His Asp Lys Glu     #   140     - Phe Phe His Pro Arg Tyr His His Arg Glu Ph - #e Arg Phe Asp Leu Ser     145                 1 - #50                 1 - #55                 1 -     #60     - Lys Ile Pro Glu Gly Glu Arg Val Thr Ala Al - #a Glu Phe Arg Ile Tyr     #               175     - Lys Asp Tyr Ile Arg Glu Arg Phe Asp Asn Gl - #u Thr Phe Gln Ile Thr     #           190     - Val Tyr Gln Val Leu Gln Glu His Ser Gly Ar - #g Glu Ser Asp Leu Phe     #       205     - Leu Leu Asp Ser Arg Thr Ile Trp Ala Ser Gl - #u Glu Gly Trp Leu Val     #   220     - Phe Asp Ile Thr Ala Thr Ser Asn His Trp Va - #l Val Asn Pro Arg His     225                 2 - #30                 2 - #35                 2 -     #40     - Asn Leu Gly Leu Gln Leu Ser Val Glu Thr Le - #u Asp Gly Gln Ser Ile     #               255     - Asn Pro Lys Leu Ala Gly Leu Ile Gly Arg Hi - #s Gly Pro Gln Asn Lys     #           270     - Gln Pro Phe Met Val Ala Phe Phe Lys Ala Th - #r Glu Val His Leu Arg     #       285     - Ser Ile Arg Ser Thr Gly Gly Lys Gln Arg Se - #r Gln Asn Arg Ser Lys     #   300     - Thr Pro Lys Asn Gln Glu Ala Leu Arg Met Al - #a Ser Val Ala Glu Asn     305                 3 - #10                 3 - #15                 3 -     #20     - Ser Ser Ser Asp Gln Arg Gln Ala Cys Lys Ly - #s His Glu Leu Tyr Val     #               335     - Ser Phe Arg Asp Leu Gly Trp Gln Asp Trp Il - #e Ile Ala Pro Glu Gly     #           350     - Tyr Ala Ala Tyr Tyr Cys Glu Gly Glu Cys Al - #a Phe Pro Leu Asn Ser     #       365     - Tyr Met Asn Ala Thr Asn His Ala Ile Val Gl - #n Thr Leu Val His Phe     #   380     - Ile Asn Pro Asp Thr Val Pro Lys Pro Cys Cy - #s Ala Pro Thr Gln Leu     385                 3 - #90                 3 - #95                 4 -     #00     - Asn Ala Ile Ser Val Leu Tyr Phe Asp Asp Se - #r Ser Asn Val Ile Leu     #               415     - Lys Lys Tyr Arg Asn Met Val Val Arg Ala Cy - #s Gly Cys His     #           430     - (2) INFORMATION FOR SEQ ID NO:26:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1926 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (vi) ORIGINAL SOURCE:               (A) ORGANISM: MURIDAE               (F) TISSUE TYPE: EMBRYO     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 93..1289     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "mOP2-PP"     #                /note=- # "mOP2 cDNA"     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:26:     - GCCAGGCACA GGTGCGCCGT CTGGTCCTCC CCGTCTGGCG TCAGCCGAGC CC - #GACCAGCT       60     - ACCAGTGGAT GCGCGCCGGC TGAAAGTCCG AG ATG GCT ATG CGT - # CCC GGG CCA      113     #Met Ala Met Arg Pro Gly Pro     # 1               5     - CTC TGG CTA TTG GGC CTT GCT CTG TGC GCG CT - #G GGA GGC GGC CAC GGT      161     Leu Trp Leu Leu Gly Leu Ala Leu Cys Ala Le - #u Gly Gly Gly His Gly     #         20     - CCG CGT CCC CCG CAC ACC TGT CCC CAG CGT CG - #C CTG GGA GCG CGC GAG      209     Pro Arg Pro Pro His Thr Cys Pro Gln Arg Ar - #g Leu Gly Ala Arg Glu     #     35     - CGC CGC GAC ATG CAG CGT GAA ATC CTG GCG GT - #G CTC GGG CTA CCG GGA      257     Arg Arg Asp Met Gln Arg Glu Ile Leu Ala Va - #l Leu Gly Leu Pro Gly     # 55     - CGG CCC CGA CCC CGT GCA CAA CCC GCC GCT GC - #C CGG CAG CCA GCG TCC      305     Arg Pro Arg Pro Arg Ala Gln Pro Ala Ala Al - #a Arg Gln Pro Ala Ser     #                 70     - GCG CCC CTC TTC ATG TTG GAC CTA TAC CAC GC - #C ATG ACC GAT GAC GAC      353     Ala Pro Leu Phe Met Leu Asp Leu Tyr His Al - #a Met Thr Asp Asp Asp     #             85     - GAC GGC GGG CCA CCA CAG GCT CAC TTA GGC CG - #T GCC GAC CTG GTC ATG      401     Asp Gly Gly Pro Pro Gln Ala His Leu Gly Ar - #g Ala Asp Leu Val Met     #        100     - AGC TTC GTC AAC ATG GTG GAA CGC GAC CGT AC - #C CTG GGC TAC CAG GAG      449     Ser Phe Val Asn Met Val Glu Arg Asp Arg Th - #r Leu Gly Tyr Gln Glu     #   115     - CCA CAC TGG AAG GAA TTC CAC TTT GAC CTA AC - #C CAG ATC CCT GCT GGG      497     Pro His Trp Lys Glu Phe His Phe Asp Leu Th - #r Gln Ile Pro Ala Gly     120                 1 - #25                 1 - #30                 1 -     #35     - GAG GCT GTC ACA GCT GCT GAG TTC CGG ATC TA - #C AAA GAA CCC AGC ACC      545     Glu Ala Val Thr Ala Ala Glu Phe Arg Ile Ty - #r Lys Glu Pro Ser Thr     #               150     - CAC CCG CTC AAC ACA ACC CTC CAC ATC AGC AT - #G TTC GAA GTG GTC CAA      593     His Pro Leu Asn Thr Thr Leu His Ile Ser Me - #t Phe Glu Val Val Gln     #           165     - GAG CAC TCC AAC AGG GAG TCT GAC TTG TTC TT - #T TTG GAT CTT CAG ACG      641     Glu His Ser Asn Arg Glu Ser Asp Leu Phe Ph - #e Leu Asp Leu Gln Thr     #       180     - CTC CGA TCT GGG GAC GAG GGC TGG CTG GTG CT - #G GAC ATC ACA GCA GCC      689     Leu Arg Ser Gly Asp Glu Gly Trp Leu Val Le - #u Asp Ile Thr Ala Ala     #   195     - AGT GAC CGA TGG CTG CTG AAC CAT CAC AAG GA - #C CTG GGA CTC CGC CTC      737     Ser Asp Arg Trp Leu Leu Asn His His Lys As - #p Leu Gly Leu Arg Leu     200                 2 - #05                 2 - #10                 2 -     #15     - TAT GTG GAA ACC GCG GAT GGG CAC AGC ATG GA - #T CCT GGC CTG GCT GGT      785     Tyr Val Glu Thr Ala Asp Gly His Ser Met As - #p Pro Gly Leu Ala Gly     #               230     - CTG CTT GGA CGA CAA GCA CCA CGC TCC AGA CA - #G CCT TTC ATG GTA ACC      833     Leu Leu Gly Arg Gln Ala Pro Arg Ser Arg Gl - #n Pro Phe Met Val Thr     #           245     - TTC TTC AGG GCC AGC CAG AGT CCT GTG CGG GC - #C CCT CGG GCA GCG AGA      881     Phe Phe Arg Ala Ser Gln Ser Pro Val Arg Al - #a Pro Arg Ala Ala Arg     #       260     - CCA CTG AAG AGG AGG CAG CCA AAG AAA ACG AA - #C GAG CTT CCG CAC CCC      929     Pro Leu Lys Arg Arg Gln Pro Lys Lys Thr As - #n Glu Leu Pro His Pro     #   275     - AAC AAA CTC CCA GGG ATC TTT GAT GAT GGC CA - #C GGT TCC CGC GGC AGA      977     Asn Lys Leu Pro Gly Ile Phe Asp Asp Gly Hi - #s Gly Ser Arg Gly Arg     280                 2 - #85                 2 - #90                 2 -     #95     - GAG GTT TGC CGC AGG CAT GAG CTC TAC GTC AG - #C TTC CGT GAC CTT GGC     1025     Glu Val Cys Arg Arg His Glu Leu Tyr Val Se - #r Phe Arg Asp Leu Gly     #               310     - TGG CTG GAC TGG GTC ATC GCC CCC CAG GGC TA - #C TCT GCC TAT TAC TGT     1073     Trp Leu Asp Trp Val Ile Ala Pro Gln Gly Ty - #r Ser Ala Tyr Tyr Cys     #           325     - GAG GGG GAG TGT GCT TTC CCA CTG GAC TCC TG - #T ATG AAC GCC ACC AAC     1121     Glu Gly Glu Cys Ala Phe Pro Leu Asp Ser Cy - #s Met Asn Ala Thr Asn     #       340     - CAT GCC ATC TTG CAG TCT CTG GTG CAC CTG AT - #G AAG CCA GAT GTT GTC     1169     His Ala Ile Leu Gln Ser Leu Val His Leu Me - #t Lys Pro Asp Val Val     #   355     - CCC AAG GCA TGC TGT GCA CCC ACC AAA CTG AG - #T GCC ACC TCT GTG CTG     1217     Pro Lys Ala Cys Cys Ala Pro Thr Lys Leu Se - #r Ala Thr Ser Val Leu     360                 3 - #65                 3 - #70                 3 -     #75     - TAC TAT GAC AGC AGC AAC AAT GTC ATC CTG CG - #T AAA CAC CGT AAC ATG     1265     Tyr Tyr Asp Ser Ser Asn Asn Val Ile Leu Ar - #g Lys His Arg Asn Met     #               390     - GTG GTC AAG GCC TGT GGC TGC CAC TGAGGCCCCG CC - #CAGCATCC TGCTTCTACT     1319     Val Val Lys Ala Cys Gly Cys His                 395     - ACCTTACCAT CTGGCCGGGC CCCTCTCCAG AGGCAGAAAC CCTTCTATGT TA - #TCATAGCT     1379     - CAGACAGGGG CAATGGGAGG CCCTTCACTT CCCCTGGCCA CTTCCTGCTA AA - #ATTCTGGT     1439     - CTTTCCCAGT TCCTCTGTCC TTCATGGGGT TTCGGGGCTA TCACCCCGCC CT - #CTCCATCC     1499     - TCCTACCCCA AGCATAGACT GAATGCACAC AGCATCCCAG AGCTATGCTA AC - #TGAGAGGT     1559     - CTGGGGTCAG CACTGAAGGC CCACATGAGG AAGACTGATC CTTGGCCATC CT - #CAGCCCAC     1619     - AATGGCAAAT TCTGGATGGT CTAAGAAGGC CCTGGAATTC TAAACTAGAT GA - #TCTGGGCT     1679     - CTCTGCACCA TTCATTGTGG CAGTTGGGAC ATTTTTAGGT ATAACAGACA CA - #TACACTTA     1739     - GATCAATGCA TCGCTGTACT CCTTGAAATC AGAGCTAGCT TGTTAGAAAA AG - #AATCAGAG     1799     - CCAGGTATAG CGGTGCATGT CATTAATCCC AGCGCTAAAG AGACAGAGAC AG - #GAGAATCT     1859     - CTGTGAGTTC AAGGCCACAT AGAAAGAGCC TGTCTCGGGA GCAGGAAAAA AA - #AAAAAAAC     1919     #        1926     - (2) INFORMATION FOR SEQ ID NO:27:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 399 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:27:     - Met Ala Met Arg Pro Gly Pro Leu Trp Leu Le - #u Gly Leu Ala Leu Cys     #                 15     - Ala Leu Gly Gly Gly His Gly Pro Arg Pro Pr - #o His Thr Cys Pro Gln     #             30     - Arg Arg Leu Gly Ala Arg Glu Arg Arg Asp Me - #t Gln Arg Glu Ile Leu     #         45     - Ala Val Leu Gly Leu Pro Gly Arg Pro Arg Pr - #o Arg Ala Gln Pro Ala     #     60     - Ala Ala Arg Gln Pro Ala Ser Ala Pro Leu Ph - #e Met Leu Asp Leu Tyr     # 80     - His Ala Met Thr Asp Asp Asp Asp Gly Gly Pr - #o Pro Gln Ala His Leu     #                 95     - Gly Arg Ala Asp Leu Val Met Ser Phe Val As - #n Met Val Glu Arg Asp     #           110     - Arg Thr Leu Gly Tyr Gln Glu Pro His Trp Ly - #s Glu Phe His Phe Asp     #       125     - Leu Thr Gln Ile Pro Ala Gly Glu Ala Val Th - #r Ala Ala Glu Phe Arg     #   140     - Ile Tyr Lys Glu Pro Ser Thr His Pro Leu As - #n Thr Thr Leu His Ile     145                 1 - #50                 1 - #55                 1 -     #60     - Ser Met Phe Glu Val Val Gln Glu His Ser As - #n Arg Glu Ser Asp Leu     #               175     - Phe Phe Leu Asp Leu Gln Thr Leu Arg Ser Gl - #y Asp Glu Gly Trp Leu     #           190     - Val Leu Asp Ile Thr Ala Ala Ser Asp Arg Tr - #p Leu Leu Asn His His     #       205     - Lys Asp Leu Gly Leu Arg Leu Tyr Val Glu Th - #r Ala Asp Gly His Ser     #   220     - Met Asp Pro Gly Leu Ala Gly Leu Leu Gly Ar - #g Gln Ala Pro Arg Ser     225                 2 - #30                 2 - #35                 2 -     #40     - Arg Gln Pro Phe Met Val Thr Phe Phe Arg Al - #a Ser Gln Ser Pro Val     #               255     - Arg Ala Pro Arg Ala Ala Arg Pro Leu Lys Ar - #g Arg Gln Pro Lys Lys     #           270     - Thr Asn Glu Leu Pro His Pro Asn Lys Leu Pr - #o Gly Ile Phe Asp Asp     #       285     - Gly His Gly Ser Arg Gly Arg Glu Val Cys Ar - #g Arg His Glu Leu Tyr     #   300     - Val Ser Phe Arg Asp Leu Gly Trp Leu Asp Tr - #p Val Ile Ala Pro Gln     305                 3 - #10                 3 - #15                 3 -     #20     - Gly Tyr Ser Ala Tyr Tyr Cys Glu Gly Glu Cy - #s Ala Phe Pro Leu Asp     #               335     - Ser Cys Met Asn Ala Thr Asn His Ala Ile Le - #u Gln Ser Leu Val His     #           350     - Leu Met Lys Pro Asp Val Val Pro Lys Ala Cy - #s Cys Ala Pro Thr Lys     #       365     - Leu Ser Ala Thr Ser Val Leu Tyr Tyr Asp Se - #r Ser Asn Asn Val Ile     #   380     - Leu Arg Lys His Arg Asn Met Val Val Lys Al - #a Cys Gly Cys His     385                 3 - #90                 3 - #95     - (2) INFORMATION FOR SEQ ID NO:28:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 1723 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: cDNA     -     (vi) ORIGINAL SOURCE:               (A) ORGANISM: Homo sapi - #ens               (F) TISSUE TYPE: HIPPOC - #AMPUS     -     (ix) FEATURE:               (A) NAME/KEY: CDS               (B) LOCATION: 490..1695     #/function= "OSTEOGENIC PROTEIN"     #               /product=- # "hOP2-PP"     #"hOP2 (cDNA)"  /note=     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:28:     - GGCGCCGGCA GAGCAGGAGT GGCTGGAGGA GCTGTGGTTG GAGCAGGAGG TG - #GCACGGCA       60     - GGGCTGGAGG GCTCCCTATG AGTGGCGGAG ACGGCCCAGG AGGCGCTGGA GC - #AACAGCTC      120     - CCACACCGCA CCAAGCGGTG GCTGCAGGAG CTCGCCCATC GCCCCTGCGC TG - #CTCGGACC      180     - GCGGCCACAG CCGGACTGGC GGGTACGGCG GCGACAGAGG CATTGGCCGA GA - #GTCCCAGT      240     - CCGCAGAGTA GCCCCGGCCT CGAGGCGGTG GCGTCCCGGT CCTCTCCGTC CA - #GGAGCCAG      300     - GACAGGTGTC GCGCGGCGGG GCTCCAGGGA CCGCGCCTGA GGCCGGCTGC CC - #GCCCGTCC      360     - CGCCCCGCCC CGCCGCCCGC CGCCCGCCGA GCCCAGCCTC CTTGCCGTCG GG - #GCGTCCCC      420     - AGGCCCTGGG TCGGCCGCGG AGCCGATGCG CGCCCGCTGA GCGCCCCAGC TG - #AGCGCCCC      480     - CGGCCTGCC ATG ACC GCG CTC CCC GGC CCG CTC TGG - # CTC CTG GGC CTG      528     #Gly Pro Leu Trp Leu Leu Gly Leu     #         10     - GCG CTA TGC GCG CTG GGC GGG GGC GGC CCC GG - #C CTG CGA CCC CCG CCC      576     Ala Leu Cys Ala Leu Gly Gly Gly Gly Pro Gl - #y Leu Arg Pro Pro Pro     #     25     - GGC TGT CCC CAG CGA CGT CTG GGC GCG CGC GA - #G CGC CGG GAC GTG CAG      624     Gly Cys Pro Gln Arg Arg Leu Gly Ala Arg Gl - #u Arg Arg Asp Val Gln     # 45     - CGC GAG ATC CTG GCG GTG CTC GGG CTG CCT GG - #G CGG CCC CGG CCC CGC      672     Arg Glu Ile Leu Ala Val Leu Gly Leu Pro Gl - #y Arg Pro Arg Pro Arg     #                 60     - GCG CCA CCC GCC GCC TCC CGG CTG CCC GCG TC - #C GCG CCG CTC TTC ATG      720     Ala Pro Pro Ala Ala Ser Arg Leu Pro Ala Se - #r Ala Pro Leu Phe Met     #             75     - CTG GAC CTG TAC CAC GCC ATG GCC GGC GAC GA - #C GAC GAG GAC GGC GCG      768     Leu Asp Leu Tyr His Ala Met Ala Gly Asp As - #p Asp Glu Asp Gly Ala     #         90     - CCC GCG GAG CGG CGC CTG GGC CGC GCC GAC CT - #G GTC ATG AGC TTC GTT      816     Pro Ala Glu Arg Arg Leu Gly Arg Ala Asp Le - #u Val Met Ser Phe Val     #    105     - AAC ATG GTG GAG CGA GAC CGT GCC CTG GGC CA - #C CAG GAG CCC CAT TGG      864     Asn Met Val Glu Arg Asp Arg Ala Leu Gly Hi - #s Gln Glu Pro His Trp     110                 1 - #15                 1 - #20                 1 -     #25     - AAG GAG TTC CGC TTT GAC CTG ACC CAG ATC CC - #G GCT GGG GAG GCG GTC      912     Lys Glu Phe Arg Phe Asp Leu Thr Gln Ile Pr - #o Ala Gly Glu Ala Val     #               140     - ACA GCT GCG GAG TTC CGG ATT TAC AAG GTG CC - #C AGC ATC CAC CTG CTC      960     Thr Ala Ala Glu Phe Arg Ile Tyr Lys Val Pr - #o Ser Ile His Leu Leu     #           155     - AAC AGG ACC CTC CAC GTC AGC ATG TTC CAG GT - #G GTC CAG GAG CAG TCC     1008     Asn Arg Thr Leu His Val Ser Met Phe Gln Va - #l Val Gln Glu Gln Ser     #       170     - AAC AGG GAG TCT GAC TTG TTC TTT TTG GAT CT - #T CAG ACG CTC CGA GCT     1056     Asn Arg Glu Ser Asp Leu Phe Phe Leu Asp Le - #u Gln Thr Leu Arg Ala     #   185     - GGA GAC GAG GGC TGG CTG GTG CTG GAT GTC AC - #A GCA GCC AGT GAC TGC     1104     Gly Asp Glu Gly Trp Leu Val Leu Asp Val Th - #r Ala Ala Ser Asp Cys     190                 1 - #95                 2 - #00                 2 -     #05     - TGG TTG CTG AAG CGT CAC AAG GAC CTG GGA CT - #C CGC CTC TAT GTG GAG     1152     Trp Leu Leu Lys Arg His Lys Asp Leu Gly Le - #u Arg Leu Tyr Val Glu     #               220     - ACT GAG GAC GGG CAC AGC GTG GAT CCT GGC CT - #G GCC GGC CTG CTG GGT     1200     Thr Glu Asp Gly His Ser Val Asp Pro Gly Le - #u Ala Gly Leu Leu Gly     #           235     - CAA CGG GCC CCA CGC TCC CAA CAG CCT TTC GT - #G GTC ACT TTC TTC AGG     1248     Gln Arg Ala Pro Arg Ser Gln Gln Pro Phe Va - #l Val Thr Phe Phe Arg     #       250     - GCC AGT CCG AGT CCC ATC CGC ACC CCT CGG GC - #A GTG AGG CCA CTG AGG     1296     Ala Ser Pro Ser Pro Ile Arg Thr Pro Arg Al - #a Val Arg Pro Leu Arg     #   265     - AGG AGG CAG CCG AAG AAA AGC AAC GAG CTG CC - #G CAG GCC AAC CGA CTC     1344     Arg Arg Gln Pro Lys Lys Ser Asn Glu Leu Pr - #o Gln Ala Asn Arg Leu     270                 2 - #75                 2 - #80                 2 -     #85     - CCA GGG ATC TTT GAT GAC GTC CAC GGC TCC CA - #C GGC CGG CAG GTC TGC     1392     Pro Gly Ile Phe Asp Asp Val His Gly Ser Hi - #s Gly Arg Gln Val Cys     #               300     - CGT CGG CAC GAG CTC TAC GTC AGC TTC CAG GA - #C CTC GGC TGG CTG GAC     1440     Arg Arg His Glu Leu Tyr Val Ser Phe Gln As - #p Leu Gly Trp Leu Asp     #           315     - TGG GTC ATC GCT CCC CAA GGC TAC TCG GCC TA - #T TAC TGT GAG GGG GAG     1488     Trp Val Ile Ala Pro Gln Gly Tyr Ser Ala Ty - #r Tyr Cys Glu Gly Glu     #       330     - TGC TCC TTC CCA CTG GAC TCC TGC ATG AAT GC - #C ACC AAC CAC GCC ATC     1536     Cys Ser Phe Pro Leu Asp Ser Cys Met Asn Al - #a Thr Asn His Ala Ile     #   345     - CTG CAG TCC CTG GTG CAC CTG ATG AAG CCA AA - #C GCA GTC CCC AAG GCG     1584     Leu Gln Ser Leu Val His Leu Met Lys Pro As - #n Ala Val Pro Lys Ala     350                 3 - #55                 3 - #60                 3 -     #65     - TGC TGT GCA CCC ACC AAG CTG AGC GCC ACC TC - #T GTG CTC TAC TAT GAC     1632     Cys Cys Ala Pro Thr Lys Leu Ser Ala Thr Se - #r Val Leu Tyr Tyr Asp     #               380     - AGC AGC AAC AAC GTC ATC CTG CGC AAA GCC CG - #C AAC ATG GTG GTC AAG     1680     Ser Ser Asn Asn Val Ile Leu Arg Lys Ala Ar - #g Asn Met Val Val Lys     #           395     #                 172 - #3TCAGCC CGCCCAGCCC TACTGCAG     Ala Cys Gly Cys His             400     - (2) INFORMATION FOR SEQ ID NO:29:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 402 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:29:     - Met Thr Ala Leu Pro Gly Pro Leu Trp Leu Le - #u Gly Leu Ala Leu Cys     #                 15     - Ala Leu Gly Gly Gly Gly Pro Gly Leu Arg Pr - #o Pro Pro Gly Cys Pro     #             30     - Gln Arg Arg Leu Gly Ala Arg Glu Arg Arg As - #p Val Gln Arg Glu Ile     #         45     - Leu Ala Val Leu Gly Leu Pro Gly Arg Pro Ar - #g Pro Arg Ala Pro Pro     #     60     - Ala Ala Ser Arg Leu Pro Ala Ser Ala Pro Le - #u Phe Met Leu Asp Leu     # 80     - Tyr His Ala Met Ala Gly Asp Asp Asp Glu As - #p Gly Ala Pro Ala Glu     #                 95     - Arg Arg Leu Gly Arg Ala Asp Leu Val Met Se - #r Phe Val Asn Met Val     #           110     - Glu Arg Asp Arg Ala Leu Gly His Gln Glu Pr - #o His Trp Lys Glu Phe     #       125     - Arg Phe Asp Leu Thr Gln Ile Pro Ala Gly Gl - #u Ala Val Thr Ala Ala     #   140     - Glu Phe Arg Ile Tyr Lys Val Pro Ser Ile Hi - #s Leu Leu Asn Arg Thr     5                 150 - #                 155 - #                 160     - Leu His Val Ser Met Phe Gln Val Val Gln Gl - #u Gln Ser Asn Arg Glu     #               175     - Ser Asp Leu Phe Phe Leu Asp Leu Gln Thr Le - #u Arg Ala Gly Asp Glu     #           190     - Gly Trp Leu Val Leu Asp Val Thr Ala Ala Se - #r Asp Cys Trp Leu Leu     #       205     - Lys Arg His Lys Asp Leu Gly Leu Arg Leu Ty - #r Val Glu Thr Glu Asp     #   220     - Gly His Ser Val Asp Pro Gly Leu Ala Gly Le - #u Leu Gly Gln Arg Ala     225                 2 - #30                 2 - #35                 2 -     #40     - Pro Arg Ser Gln Gln Pro Phe Val Val Thr Ph - #e Phe Arg Ala Ser Pro     #               255     - Ser Pro Ile Arg Thr Pro Arg Ala Val Arg Pr - #o Leu Arg Arg Arg Gln     #           270     - Pro Lys Lys Ser Asn Glu Leu Pro Gln Ala As - #n Arg Leu Pro Gly Ile     #       285     - Phe Asp Asp Val His Gly Ser His Gly Arg Gl - #n Val Cys Arg Arg His     #   300     - Glu Leu Tyr Val Ser Phe Gln Asp Leu Gly Tr - #p Leu Asp Trp Val Ile     305                 3 - #10                 3 - #15                 3 -     #20     - Ala Pro Gln Gly Tyr Ser Ala Tyr Tyr Cys Gl - #u Gly Glu Cys Ser Phe     #               335     - Pro Leu Asp Ser Cys Met Asn Ala Thr Asn Hi - #s Ala Ile Leu Gln Ser     #           350     - Leu Val His Leu Met Lys Pro Asn Ala Val Pr - #o Lys Ala Cys Cys Ala     #       365     - Pro Thr Lys Leu Ser Ala Thr Ser Val Leu Ty - #r Tyr Asp Ser Ser Asn     #   380     - Asn Val Ile Leu Arg Lys Ala Arg Asn Met Va - #l Val Lys Ala Cys Gly     385                 3 - #90                 3 - #95                 4 -     #00     - Cys His     - (2) INFORMATION FOR SEQ ID NO:30:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 102 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (ix) FEATURE:               (A) NAME/KEY: Protein               (B) LOCATION: 1..102     #/label= OPX) OTHER INFORMATION:     #"WHEREIN EACH XAA IS=     #    INDEPENDENTLY SELECTED FROM A     #    GROUP OF ONE OR MORE SPECIFIED     #    AMINO ACIDS AS DEFINED IN THE     #    SPECIFICATION (SECTION II.B.2.)"     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:30:     - Cys Xaa Xaa His Glu Leu Tyr Val Xaa Phe Xa - #a Asp Leu Gly Trp Xaa     #                15     - Asp Trp Xaa Ile Ala Pro Xaa Gly Tyr Xaa Al - #a Tyr Tyr Cys Glu Gly     #            30     - Glu Cys Xaa Phe Pro Leu Xaa Ser Xaa Met As - #n Ala Thr Asn His Ala     #        45     - Ile Xaa Gln Xaa Leu Val His Xaa Xaa Xaa Pr - #o Xaa Xaa Val Pro Lys     #    60     - Xaa Cys Cys Ala Pro Thr Xaa Leu Xaa Ala Xa - #a Ser Val Leu Tyr Xaa     #80     - Asp Xaa Ser Xaa Asn Val Xaa Leu Xaa Lys Xa - #a Arg Asn Met Val Val     #                95     - Xaa Ala Cys Gly Cys His                 100     - (2) INFORMATION FOR SEQ ID NO:31:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 97 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (ix) FEATURE:               (A) NAME/KEY: Protein               (B) LOCATION: 1..97     #/label= OPX-7CTHER INFORMATION:     #"WHEREIN EACH XAA INDEPENDENTLY     #    INDICATES ONE OF THE 20     #    NATURALLY-OCCURRING L-ISOMER,     #    A-AMINO ACIDS, OR A DERIVATIVE     #    THEREOF."     -      (xi) SEQUENCE DESCRIPTION: SEQ ID NO: - #31:     - Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Xaa Xaa Xaa     #                15     - Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Cys Xaa Xa - #a Xaa Cys Xaa Xaa Xaa     #            30     - Xaa Xaa Xaa Cys Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Xaa Xaa Xaa     #        45     - Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Cys Cys Xaa Xaa     #    60     - Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Xaa Xaa Xaa     #80     - Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Cys Xaa Cys     #                95     - Xaa     - (2) INFORMATION FOR SEQ ID NO:32:     -      (i) SEQUENCE CHARACTERISTICS:     #acids    (A) LENGTH: 102 amino               (B) TYPE: amino acid               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: protein     -     (ix) FEATURE:               (A) NAME/KEY: Protein               (B) LOCATION: 1..102     #/label= OPX-8CTHER INFORMATION:     #"WHEREIN EACH XAA INDEPENDENTLY     #    INDICATES ONE OF THE 20     #    NATURALLY-OCCURRING L-ISOMER     #    A-AMINO AICDS, OR A DERIVATIVE     #    THEREOF."     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:32:     - Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Xaa Xaa Xaa     #                15     - Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Cys Xaa Xaa     #            30     - Xaa Cys Xaa Xaa Xaa Xaa Xaa Xaa Cys Xaa Xa - #a Xaa Xaa Xaa Xaa Xaa     #        45     - Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Xaa Xaa Xaa     #    60     - Xaa Cys Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Xaa Xaa Xaa     #80     - Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xa - #a Xaa Xaa Xaa Xaa Xaa     #                95     - Xaa Xaa Cys Xaa Cys Xaa                 100     - (2) INFORMATION FOR SEQ ID NO:33:     -      (i) SEQUENCE CHARACTERISTICS:     #pairs    (A) LENGTH: 314 base               (B) TYPE: nucleic acid               (C) STRANDEDNESS: single               (D) TOPOLOGY: linear     -     (ii) MOLECULE TYPE: CDNA     -    (iii) HYPOTHETICAL: YES     -     (iv) ANTI-SENSE: NO     -     (ix) FEATURE:               (A) NAME/KEY: misc.sub.-- - #feature               (B) LOCATION: 1..314     #/note= "CONSENSUS PROBE"MATION:     -     (xi) SEQUENCE DESCRIPTION: SEQ ID NO:33:     - GATCCTAATG GGCTGTACGT GGACTTCCAG CGCGACGTGG GCTGGGACGA CT - #GGATCATC       60     - GCCCCCGTCG ACTTCGACGC CTACTACTGC TCCGGAGCCT GCCAGTTCCC CT - #CTGCGGAT      120     - CACTTCAACA GCACCAACCA CGCCGTGGTG CAGACCCTGG TGAACAACAT GA - #ACCCCGGC      180     - AAGGTACCCA AGCCCTGCTG CGTGCCCACC GAGCTGTCCG CCATCAGCAT GC - #TGTACCTG      240     - GACGAGAATT CCACCGTGGT GCTGAAGAAC TACCAGGAGA TGACCGTGGT GG - #GCTGCGGC      300     #    314     __________________________________________________________________________ 

What is claimed is:
 1. A device for implantation in a mammal, said device comprising:chondrogenic protein dispersed within a biocompatible, in vivo biodegradable matrix defining pores of a dimension sufficient to permit influx, proliferation and differentiation of migratory progenitor cells from the body of said mammal, the improvement wherein said chondrogenic protein comprisessubstantially pure protein capable of inducing cartilage formation in said mammal, said chondrogenic protein comprising the amino acid sequence:V-P-K-P-C-C-A-P-T.
 2. The device of claim 1 wherein said matrix comprises close-packed particulate matter having a particle size within the range of 70-850 μm.
 3. The device of claim 2 wherein said particulate matter has a particle size within the range of 70-420 μm.
 4. The device of claim 1 wherein said matrix comprises muscle, allogenic bone or demineralized, protein-extracted, allogenic bone.
 5. The device of claim 1 wherein said matrix comprises a material selected from the group consisting of: collagen, hydroxyapatite, tricalcium phosphate, polymers comprising lactic acid monomer units, polymers comprising glycolic acid monomer units, allogenic bone, and mixtures thereof.
 6. The device of claim 1 wherein said matrix is disposed within the marrow cavity of allogenic bone.
 7. The device of claim 1 wherein said matrix comprises demineralized, protein extracted, xenogenic bone.
 8. The device of claim 7 wherein said matrix is treated with a protease.
 9. The device of claim 1 wherein said matrix comprises a molded porous solid.
 10. The device of claim 1 wherein said chondrogenic protein is unglycosylated.
 11. The device of claim 1 wherein said chondrogenic protein is glycosylated.
 12. The device of claim 11 wherein said chondrogenic protein has a molecular weight of about 30 kD when oxidized as determined by comparison to molecular weight standards in SDS-polyacrylamide gel electrophoresis.
 13. The device of claim 1 wherein said chondrogenic protein comprises a pair of polypeptide chains.
 14. The device of claim 13 wherein one chain of said pair of polypeptide chains has a molecular weight of about 14 kD and the other has an apparent molecular weight of about 16 kD, both as determined after reduction by comparison to molecular weight standards in SDS-polyacrylamide gel electrophoresis.
 15. The device of claim 13 wherein one chain of said pair of polypeptide chains has a molecular weight of about 16 kD and the other has a molecular weight of about 18 kD, both as determined after reduction by comparison to molecular weight standards in SDS-polyacrylamide gel electrophoresis.
 16. The device of claim 1 wherein said chondrogenic protein has the approximate amino acid composition set forth below:

    ______________________________________                Rel. no.               Rel. no.     Amino acid residue                res./molec.                          Amino acid residue                                       res./molec.     ______________________________________     Aspartic acid                22        Tyrosine     11     Asparagine           Valine       14     Glutamic acid/                24        Methionine    3     Glutamine            Cysteine     16     Serine     24        Isoleucine   15     Glycine    29        Leucine      15     Histidine   5        Proline      14     Arginine   13        Phenylalanine                                        7     Threonine  11        Tryptophan   ND     Alanine    18     Lysine     12     ______________________________________


17. A method of inducing endochondral bone formation, local bone formation or local cartilage formation in a mammal comprising the step of:providing to a locus accessible to migratory progenitor cells of said mammal a protein, admixed with a matrix, produced by expression of recombinant DNA in a host cell and substantially free of other contaminating proteins, said protein comprisinga pair of polypeptide chains disulfide bonded to form a dimeric species, wherein said protein is OP-1 or a protein sufficiently duplicative thereof, and wherein said dimeric species has a conformation capable of inducing endochondral bone formation, local bone formation or local cartilage formation when implanted at said locus in a mammal in association with a matrix.
 18. The method of claim 17 wherein said locus is selected from the group consisting of: a periodontal locus, a dental locus, a craniofacial locus, an osteoarthritic locus, a non-union fracture locus, a weight-bearing locus and a skeletal locus.
 19. A method of inducing endochondral bone formation, local bone formation or local cartilage formation in a mammal comprising the step of:providing to a locus accessible to migratory progenitor cells of said mammal a protein, admixed with a matrix, produced by expression of recombinant DNA in a host cell and substantially free of other contaminating proteins, said protein comprisinga pair of polypeptide chains disulfide bonded to form a dimeric species, wherein said protein is CBMP2a or a protein comprising the amino acid sequence V-P-K-P-C-C-A-P-T, and wherein said dimeric species has a conformation capable of inducing endochondral bone formation, local bone formation or local cartilage formation when implanted at said locus in a mammal in association with a matrix, and further wherein said locus is selected from the group consisting of: a periodontal locus, a dental locus, a craniofacial locus, an osteoarthritic locus, a nonunion fracture locus, a weight-bearing locus and a skeletal locus. 